diff --git a/resources/views/business/pages/courier-payables/agreement-signing.blade.php b/resources/views/business/pages/courier-payables/agreement-signing.blade.php
index 219c2dc9..d97fda09 100644
--- a/resources/views/business/pages/courier-payables/agreement-signing.blade.php
+++ b/resources/views/business/pages/courier-payables/agreement-signing.blade.php
@@ -249,6 +249,63 @@
             color: var(--agreement-muted);
         }
 
+        .agreement-courier-search-wrap {
+            position: relative;
+        }
+
+        .agreement-courier-native-select--enhanced {
+            position: absolute;
+            width: 1px;
+            height: 1px;
+            padding: 0;
+            margin: -1px;
+            overflow: hidden;
+            clip: rect(0, 0, 0, 0);
+            white-space: nowrap;
+            clip-path: inset(50%);
+            border: 0;
+        }
+
+        .agreement-courier-options {
+            position: absolute;
+            z-index: 20;
+            top: calc(100% + 4px);
+            right: 0;
+            left: 0;
+            max-height: 16rem;
+            overflow: auto;
+            border: 1px solid var(--agreement-border);
+            border-radius: 8px;
+            background: var(--agreement-surface);
+            box-shadow: 0 4px 8px rgba(23, 23, 23, 0.1);
+        }
+
+        .agreement-courier-option {
+            min-height: 34px;
+            padding: 0.5rem 0.65rem;
+            color: var(--agreement-ink);
+            cursor: pointer;
+        }
+
+        .agreement-courier-option:hover,
+        .agreement-courier-option.is-active {
+            background: var(--agreement-accent-soft);
+            color: var(--agreement-accent);
+        }
+
+        .agreement-courier-options-status {
+            padding: 0.5rem 0.65rem;
+            border-top: 1px solid var(--agreement-border);
+            color: var(--agreement-muted);
+            font-size: 0.75rem;
+        }
+
+        .agreement-courier-native-select--enhanced:focus-visible,
+        .agreement-courier-search-wrap .agreement-control:focus-visible {
+            outline: 0;
+            box-shadow: 0 0 0 3px rgba(133, 102, 50, 0.2);
+        }
+
         .agreement-search {
             position: relative;
         }
@@ -1368,15 +1425,21 @@
                         <div class="agreement-form-grid">
                             <div class="agreement-field">
                                 <label for="agreement-courier">快递公司 <span class="agreement-required" aria-hidden="true">*</span></label>
-                                <select class="agreement-control" id="agreement-courier" name="courier_name" data-courier-select required>
-                                    <option value="">请选择</option>
-                                    @if ($agreementCourierNames->isEmpty())
-                                        <option value="" disabled>暂无可选快递资料</option>
-                                    @endif
-                                    @foreach ($agreementCourierNames as $courierName)
-                                        <option value="{{ $courierName }}" data-esign-account="{{ $agreementCourierAccounts[$courierName] ?? '' }}">{{ $courierName }}</option>
-                                    @endforeach
-                                </select>
+                                <div class="agreement-courier-search-wrap" data-courier-control>
+                                    <select class="agreement-control" id="agreement-courier" name="courier_name" data-courier-select required>
+                                        <option value="">请选择</option>
+                                        @if ($agreementCourierNames->isEmpty())
+                                            <option value="" disabled>暂无可选快递资料</option>
+                                        @endif
+                                        @foreach ($agreementCourierNames as $courierName)
+                                            <option value="{{ $courierName }}" data-esign-account="{{ $agreementCourierAccounts[$courierName] ?? '' }}">{{ $courierName }}</option>
+                                        @endforeach
+                                    </select>
+                                    <div class="agreement-courier-search-wrap" data-courier-search-wrap hidden>
+                                        <input class="agreement-control" id="agreement-courier-search" type="search" placeholder="输入快递名称搜索" autocomplete="off" role="combobox" aria-autocomplete="list" aria-haspopup="listbox" aria-expanded="false" aria-controls="agreement-courier-options" data-courier-search>
+                                        <div class="agreement-courier-options" id="agreement-courier-options" role="listbox" aria-label="快递资料" hidden data-courier-options></div>
+                                    </div>
+                                </div>
                             </div>
                             <div class="agreement-field">
                                 <label for="agreement-document-type">文件类型 <span class="agreement-required" aria-hidden="true">*</span></label>
@@ -1920,6 +1983,18 @@
             var subjectNameInput = root.querySelector('[data-subject-name]');
             var subjectCodeInput = root.querySelector('[data-subject-code]');
             var courierSelect = root.querySelector('[data-courier-select]');
+            var courierSearchWrap = root.querySelector('[data-courier-search-wrap]');
+            var courierSearch = root.querySelector('[data-courier-search]');
+            var courierOptionsList = root.querySelector('[data-courier-options]');
+            var courierControl = root.querySelector('[data-courier-control]');
+            var courierLabel = root.querySelector('label[for="agreement-courier"]');
+            var courierOptions = courierSelect ? Array.prototype.filter.call(courierSelect.options, function (option) {
+                return option.value !== '' && !option.disabled;
+            }).map(function (option) {
+                return { value: option.value, account: option.dataset.esignAccount || '' };
+            }) : [];
+            var visibleCourierIndexes = [];
+            var activeCourierIndex = -1;
             var esignAccountInput = root.querySelector('input[name="esign_account"]');
             var accountSignerTypeField = root.querySelector('[data-account-signer-type-field]');
             var accountSignerTypeInputs = Array.prototype.slice.call(root.querySelectorAll('[data-account-signer-type]'));
@@ -2259,6 +2334,197 @@
                 }
             }
 
+            function closeCourierOptions() {
+                if (!courierSearch || !courierOptionsList) {
+                    return;
+                }
+
+                courierOptionsList.hidden = true;
+                courierSearch.setAttribute('aria-expanded', 'false');
+                courierSearch.removeAttribute('aria-activedescendant');
+                activeCourierIndex = -1;
+            }
+
+            function renderCourierOptions(query) {
+                if (!courierSearch || !courierOptionsList) {
+                    return;
+                }
+
+                var normalizedQuery = String(query || '').trim().toLocaleLowerCase();
+                var matches = [];
+
+                courierOptions.forEach(function (option, index) {
+                    if (normalizedQuery === '' || option.value.toLocaleLowerCase().indexOf(normalizedQuery) !== -1) {
+                        matches.push(index);
+                    }
+                });
+
+                visibleCourierIndexes = matches.slice(0, 80);
+                courierOptionsList.innerHTML = '';
+
+                if (visibleCourierIndexes.length === 0) {
+                    var empty = document.createElement('div');
+                    empty.className = 'agreement-courier-options-status';
+                    empty.setAttribute('role', 'status');
+                    empty.textContent = normalizedQuery === '' ? '暂无可选快递资料' : '没有匹配的快递名称';
+                    courierOptionsList.appendChild(empty);
+                } else {
+                    visibleCourierIndexes.forEach(function (optionIndex) {
+                        var option = courierOptions[optionIndex];
+                        var item = document.createElement('div');
+                        item.className = 'agreement-courier-option';
+                        item.id = 'agreement-courier-option-' + optionIndex;
+                        item.setAttribute('role', 'option');
+                        item.setAttribute('aria-selected', courierSelect.value === option.value ? 'true' : 'false');
+                        item.dataset.courierOption = String(optionIndex);
+                        item.textContent = option.value;
+                        courierOptionsList.appendChild(item);
+                    });
+
+                    if (matches.length > visibleCourierIndexes.length) {
+                        var status = document.createElement('div');
+                        status.className = 'agreement-courier-options-status';
+                        status.setAttribute('role', 'status');
+                        status.textContent = '匹配到 ' + matches.length + ' 项，当前显示前 80 项；继续输入可缩小范围';
+                        courierOptionsList.appendChild(status);
+                    }
+                }
+
+                courierOptionsList.hidden = false;
+                courierSearch.setAttribute('aria-expanded', 'true');
+                activeCourierIndex = -1;
+                courierSearch.removeAttribute('aria-activedescendant');
+            }
+
+            function setActiveCourierOption(position) {
+                if (!courierOptionsList || visibleCourierIndexes.length === 0) {
+                    return;
+                }
+
+                activeCourierIndex = (position + visibleCourierIndexes.length) % visibleCourierIndexes.length;
+                var optionIndex = visibleCourierIndexes[activeCourierIndex];
+                var optionElement = courierOptionsList.querySelector('[data-courier-option="' + optionIndex + '"]');
+                courierOptionsList.querySelectorAll('.agreement-courier-option').forEach(function (item) {
+                    item.classList.toggle('is-active', item === optionElement);
+                });
+                courierSearch.setAttribute('aria-activedescendant', 'agreement-courier-option-' + optionIndex);
+                optionElement && optionElement.scrollIntoView({ block: 'nearest' });
+            }
+
+            function syncCourierSelection() {
+                if (!courierSelect || !courierSearch) {
+                    return;
+                }
+
+                var enteredName = courierSearch.value.trim();
+                var option = courierOptions.find(function (item) {
+                    return item.value.toLocaleLowerCase() === enteredName.toLocaleLowerCase();
+                });
+
+                if (option) {
+                    courierSearch.value = option.value;
+                    courierSelect.value = option.value;
+                    courierSearch.setCustomValidity('');
+                } else {
+                    courierSelect.value = '';
+                    courierSearch.setCustomValidity(enteredName === '' ? '请选择快递公司' : '请从快递资料中选择快递公司');
+                }
+            }
+
+            function chooseCourierOption(index) {
+                if (!courierSearch || !courierSelect || !courierOptions[index]) {
+                    return;
+                }
+
+                courierSearch.value = courierOptions[index].value;
+                syncCourierSelection();
+                closeCourierOptions();
+                syncEsignAccount();
+                refreshPreview();
+            }
+
+            function initializeCourierSearch() {
+                if (!courierSelect || !courierSearchWrap || !courierSearch || !courierOptionsList) {
+                    return;
+                }
+
+                courierSearchWrap.hidden = false;
+                courierSelect.classList.add('agreement-courier-native-select--enhanced');
+                courierSelect.setAttribute('aria-hidden', 'true');
+                courierSelect.tabIndex = -1;
+                courierSelect.required = false;
+                courierSearch.value = courierSelect.value;
+                courierSearch.required = true;
+                if (courierLabel) {
+                    courierLabel.htmlFor = courierSearch.id;
+                }
+                syncCourierSelection();
+
+                courierSearch.addEventListener('focus', function () {
+                    courierSearch.select();
+                    renderCourierOptions('');
+                });
+                courierSearch.addEventListener('input', function () {
+                    syncCourierSelection();
+                    renderCourierOptions(courierSearch.value);
+                    syncEsignAccount();
+                    refreshPreview();
+                });
+                courierSearch.addEventListener('keydown', function (event) {
+                    if (event.key === 'ArrowDown') {
+                        event.preventDefault();
+                        if (courierOptionsList.hidden) {
+                            renderCourierOptions(courierSearch.value);
+                        }
+                        setActiveCourierOption(activeCourierIndex + 1);
+                    } else if (event.key === 'ArrowUp') {
+                        event.preventDefault();
+                        if (courierOptionsList.hidden) {
+                            renderCourierOptions(courierSearch.value);
+                        }
+                        setActiveCourierOption(activeCourierIndex < 0 ? visibleCourierIndexes.length - 1 : activeCourierIndex - 1);
+                    } else if (event.key === 'Enter' && !courierOptionsList.hidden) {
+                        event.preventDefault();
+                        var selectedIndex = activeCourierIndex >= 0
+                            ? visibleCourierIndexes[activeCourierIndex]
+                            : visibleCourierIndexes.find(function (optionIndex) {
+                                return courierOptions[optionIndex].value.toLocaleLowerCase() === courierSearch.value.trim().toLocaleLowerCase();
+                            });
+                        if (selectedIndex === undefined && visibleCourierIndexes.length === 1) {
+                            selectedIndex = visibleCourierIndexes[0];
+                        }
+                        if (selectedIndex !== undefined) {
+                            chooseCourierOption(selectedIndex);
+                        }
+                    } else if (event.key === 'Escape') {
+                        closeCourierOptions();
+                    }
+                });
+                courierSearch.addEventListener('blur', function () {
+                    window.setTimeout(function () {
+                        if (courierControl && !courierControl.contains(document.activeElement)) {
+                            closeCourierOptions();
+                        }
+                    }, 0);
+                });
+                courierOptionsList.addEventListener('mousedown', function (event) {
+                    if (event.target.closest('[data-courier-option]')) {
+                        event.preventDefault();
+                    }
+                });
+                courierOptionsList.addEventListener('click', function (event) {
+                    var optionElement = event.target.closest('[data-courier-option]');
+                    if (optionElement) {
+                        chooseCourierOption(Number(optionElement.dataset.courierOption));
+                    }
+                });
+                root.addEventListener('click', function (event) {
+                    if (courierControl && !courierControl.contains(event.target)) {
+                        closeCourierOptions();
+                    }
+                });
+            }
+
             function setText(selector, value) {
                 root.querySelectorAll(selector).forEach(function (target) {
                     target.textContent = value;
@@ -2718,6 +2984,10 @@
 
             if (courierSelect) {
                 courierSelect.addEventListener('change', function () {
+                    if (courierSearch) {
+                        courierSearch.value = courierSelect.value;
+                        syncCourierSelection();
+                    }
                     syncEsignAccount();
                     refreshPreview();
                 });
@@ -2755,6 +3025,10 @@
                         });
                         if (courierOption) {
                             courierSelect.value = option.dataset.carrier;
+                            if (courierSearch) {
+                                courierSearch.value = option.dataset.carrier;
+                                syncCourierSelection();
+                            }
                             syncEsignAccount();
                         }
                     }
@@ -2829,6 +3103,7 @@
 
             var initialUrl = new URL(window.location.href);
             var initialView = initialUrl.searchParams.get('agreement_view') || 'tasks';
+            initializeCourierSearch();
             renderSubjectSelect();
             renderSubjectList();
             showTab(initialView, { updateUrl: false });
diff --git a/tests/Feature/Business/AgreementSigningPageTest.php b/tests/Feature/Business/AgreementSigningPageTest.php
index 4e777ca7..1643fc1a 100644
--- a/tests/Feature/Business/AgreementSigningPageTest.php
+++ b/tests/Feature/Business/AgreementSigningPageTest.php
@@ -63,6 +63,10 @@ class AgreementSigningPageTest extends FeatureTestCase
             ->assertDontSee('data-agreement-step-panel', false)
             ->assertSeeText('发起签章请求')
             ->assertSeeText('快递公司')
+            ->assertSee('data-courier-search', false)
+            ->assertSee('placeholder="输入快递名称搜索"', false)
+            ->assertSee('aria-haspopup="listbox"', false)
+            ->assertSee('data-courier-options', false)
             ->assertSeeText('文件类型')
             ->assertSeeText('收款账户证明')
             ->assertSeeText('TPL-ACCOUNT-CERT-V2')
@@ -118,6 +122,8 @@ class AgreementSigningPageTest extends FeatureTestCase
                 'agreement_view' => 'create',
             ]))
             ->assertOk()
+            ->assertSee('data-courier-search', false)
+            ->assertSee('data-courier-select required', false)
             ->assertSee('<option value="顺丰" data-esign-account="13800000001">顺丰</option>', false)
             ->assertSee('<option value="韵达" data-esign-account="">韵达</option>', false)
             ->assertDontSee('<option value="新北中通"', false);