diff --git a/app/Http/Controllers/Business/CourierAgreementSignatures.php b/app/Http/Controllers/Business/CourierAgreementSignatures.php
index f62a789e..1547be58 100644
--- a/app/Http/Controllers/Business/CourierAgreementSignatures.php
+++ b/app/Http/Controllers/Business/CourierAgreementSignatures.php
@@ -283,6 +283,7 @@ class CourierAgreementSignatures extends Controller
             'esign_account' => ['required', 'string', 'max:255'],
             'secondary_esign_account' => ['required_if:document_type,entity-change,cooperation-contract,authorization', 'nullable', 'string', 'max:255'],
             'operator_name' => ['required_if:document_type,account-proof,account-change', 'nullable', 'string', 'min:2', 'max:100'],
+            'counterparty_organization_name' => ['required_if:document_type,account-proof,account-change', 'nullable', 'string', 'min:2', 'max:255'],
             'archive_mode' => ['required', 'in:auto,manual'],
             'account_proof_effective_date' => ['required_if:document_type,account-proof', 'date'],
             'account_proof_account_name' => ['required_if:document_type,account-proof', 'string', 'max:255'],
@@ -369,7 +370,7 @@ class CourierAgreementSignatures extends Controller
     private function counterpartyOrganizationName(array $data): string
     {
         return match ($data['document_type']) {
-            'account-proof', 'account-change' => trim((string) $data['courier_name']),
+            'account-proof', 'account-change' => trim((string) $data['counterparty_organization_name']),
             'shared-contract' => trim((string) (($data['shared_courier_names'][0] ?? null) ?: ($data['shared_courier_name'] ?? $data['courier_name']))),
             'entity-change' => trim((string) ($data['former_company_name'] ?? $data['courier_name'])),
             'authorization' => trim((string) ($data['principal_name'] ?? $data['courier_name'])),
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 861cbea9..46003042 100644
--- a/resources/views/business/pages/courier-payables/agreement-signing.blade.php
+++ b/resources/views/business/pages/courier-payables/agreement-signing.blade.php
@@ -1404,6 +1404,11 @@
                                 <input class="agreement-control" id="agreement-esign-account" name="esign_account" type="text" value="" data-esign-account placeholder="手机号或邮箱" autocomplete="email" required>
                                 <p class="agreement-help">选择快递公司后自动带出工作平台的“电子签章经办人”（dzqzjbr）；如资料未维护，可手工填写对方在 E 签宝实名绑定的手机号或邮箱。</p>
                             </div>
+                            <div class="agreement-field" data-account-organization-field>
+                                <label for="agreement-counterparty-organization">对方签署企业全称 <span class="agreement-required" aria-hidden="true">*</span></label>
+                                <input class="agreement-control" id="agreement-counterparty-organization" name="counterparty_organization_name" type="text" placeholder="填写对方在 E 签宝认证的企业全称" autocomplete="organization" data-account-organization-name required>
+                                <p class="agreement-help">必须与对方 E 签宝企业认证名称一致；这是签署主体，不要求与银行卡持卡人姓名一致。</p>
+                            </div>
                             <div class="agreement-field">
                                 <label for="agreement-operator-name">对方 E 签宝实名认证姓名 <span class="agreement-required" data-account-operator-required aria-hidden="true">*</span></label>
                                 <input class="agreement-control" id="agreement-operator-name" name="operator_name" type="text" placeholder="填写与 E 签宝账号匹配的实名姓名" autocomplete="name" data-account-operator-name required>
@@ -1882,6 +1887,8 @@
             var subjectCodeInput = root.querySelector('[data-subject-code]');
             var courierSelect = root.querySelector('[data-courier-select]');
             var esignAccountInput = root.querySelector('input[name="esign_account"]');
+            var accountOrganizationField = root.querySelector('[data-account-organization-field]');
+            var accountOrganizationInput = root.querySelector('[data-account-organization-name]');
             var operatorNameInput = root.querySelector('[data-account-operator-name]');
             var operatorRequiredMark = root.querySelector('[data-account-operator-required]');
             var sharedCourierList = root.querySelector('[data-shared-courier-list]');
@@ -2392,12 +2399,19 @@
                 var templateType = documentOption.value;
                 var courier = fieldValue('[name="courier_name"]', '快递公司');
                 var companyName = fieldValue('[name="company_full_name"]', '待填写公司全称');
-                var accountOperatorRequired = templateType === 'account-proof' || templateType === 'account-change';
+                var accountAgreement = templateType === 'account-proof' || templateType === 'account-change';
+                if (accountOrganizationField) {
+                    accountOrganizationField.hidden = !accountAgreement;
+                }
+                if (accountOrganizationInput) {
+                    accountOrganizationInput.disabled = !accountAgreement;
+                    accountOrganizationInput.required = accountAgreement;
+                }
                 if (operatorNameInput) {
-                    operatorNameInput.required = accountOperatorRequired;
+                    operatorNameInput.required = accountAgreement;
                 }
                 if (operatorRequiredMark) {
-                    operatorRequiredMark.hidden = !accountOperatorRequired;
+                    operatorRequiredMark.hidden = !accountAgreement;
                 }
                 activateTemplate(templateType);
                 refreshSignerAccountLabels(templateType);
@@ -2439,8 +2453,7 @@
                     setPreviewValue('proofAccountName', fieldValue('[name="account_proof_account_name"]', '待填写'));
                     setPreviewValue('proofBankName', fieldValue('[name="account_proof_bank_name"]', '待填写'));
                     setPreviewValue('proofBankAccount', fieldValue('[name="account_proof_bank_account"]', '待填写'));
-                    var proofName = fieldValue('[name="account_proof_account_name"]', '待填写');
-                    setPreviewValue('proofSigner', proofName + (/(公司|有限公司|有限责任|企业|集团|合作社|事务所|中心|厂)/.test(proofName) ? ' 公司盖章' : ' 签字'));
+                    setPreviewValue('proofSigner', '公司盖章');
                 }
 
                 if (templateType === 'account-change') {
@@ -2452,8 +2465,7 @@
                     setPreviewValue('newAccountName', fieldValue('[name="new_account_name"]', '待填写'));
                     setPreviewValue('newBankName', fieldValue('[name="new_bank_name"]', '待填写'));
                     setPreviewValue('newBankAccount', fieldValue('[name="new_bank_account"]', '待填写'));
-                    var changeName = fieldValue('[name="new_account_name"]', '待填写');
-                    setPreviewValue('changeSigner', changeName + (/(公司|有限公司|有限责任|企业|集团|合作社|事务所|中心|厂)/.test(changeName) ? ' 公司盖章' : ' 签字'));
+                    setPreviewValue('changeSigner', '公司盖章');
                 }
 
                 if (templateType === 'entity-change') {
diff --git a/tests/Feature/Business/AgreementSigningPageTest.php b/tests/Feature/Business/AgreementSigningPageTest.php
index cf5778fc..0e7cb92a 100644
--- a/tests/Feature/Business/AgreementSigningPageTest.php
+++ b/tests/Feature/Business/AgreementSigningPageTest.php
@@ -74,8 +74,12 @@ class AgreementSigningPageTest extends FeatureTestCase
             ->assertSee("labels.secondary = '我方 E 签宝账号'", false)
             ->assertSee("labels.primary = '委托方 E 签宝账号'", false)
             ->assertSee("labels.secondary = '受托方 E 签宝账号'", false)
+            ->assertSeeText('对方签署企业全称')
+            ->assertSeeText('必须与对方 E 签宝企业认证名称一致')
             ->assertSeeText('对方 E 签宝实名认证姓名')
             ->assertSeeText('仅用于 E 签宝身份核验，不是收款人姓名')
+            ->assertSee("setPreviewValue('proofSigner', '公司盖章')", false)
+            ->assertSee("setPreviewValue('changeSigner', '公司盖章')", false)
             ->assertSeeText('合作合同统一使用我方账号 18052733960')
             ->assertSeeText('填写变量')
             ->assertSeeText('签署完成后自动归档')
diff --git a/tests/Feature/Business/CourierAgreementSignatureWorkflowTest.php b/tests/Feature/Business/CourierAgreementSignatureWorkflowTest.php
index 69ffeb1c..76e5d939 100644
--- a/tests/Feature/Business/CourierAgreementSignatureWorkflowTest.php
+++ b/tests/Feature/Business/CourierAgreementSignatureWorkflowTest.php
@@ -48,7 +48,7 @@ class CourierAgreementSignatureWorkflowTest extends FeatureTestCase
         $this->assertSame('TPL-ACCOUNT-CERT-V2', $signature->template_code);
         $this->assertSame(CourierAgreementSignature::STATUS_SIGNING, $signature->status);
         $this->assertSame('flow-agreement-001', $signature->esign_sign_flow_id);
-        $this->assertSame('新北中通', $signature->organization_name);
+        $this->assertSame('新北中通快递有限公司', $signature->organization_name);
         $this->assertSame('2026-09-21', $signature->payload['signature_date']);
         Storage::disk('uploads')->assertExists($signature->source_pdf_path);
         $this->assertSame('新北中通快递有限公司', $signature->payload['account_proof_account_name']);
@@ -59,7 +59,7 @@ class CourierAgreementSignatureWorkflowTest extends FeatureTestCase
             }
 
             return data_get($request->data(), 'signers.0.signerType') === 1
-                && data_get($request->data(), 'signers.0.orgSignerInfo.orgName') === '新北中通'
+                && data_get($request->data(), 'signers.0.orgSignerInfo.orgName') === '新北中通快递有限公司'
                 && data_get($request->data(), 'signers.0.orgSignerInfo.transactorInfo.psnInfo.psnName') === '张经理';
         });
 
@@ -88,7 +88,7 @@ class CourierAgreementSignatureWorkflowTest extends FeatureTestCase
             }
 
             return data_get($request->data(), 'signers.0.signerType') === 1
-                && data_get($request->data(), 'signers.0.orgSignerInfo.orgName') === '新北中通'
+                && data_get($request->data(), 'signers.0.orgSignerInfo.orgName') === '新北中通快递有限公司'
                 && data_get($request->data(), 'signers.0.orgSignerInfo.transactorInfo.psnInfo.psnName') === '张经理'
                 && data_get($request->data(), 'signers.0.psnSignerInfo') === null;
         });
@@ -105,7 +105,7 @@ class CourierAgreementSignatureWorkflowTest extends FeatureTestCase
             ->assertRedirect();
 
         $signature = CourierAgreementSignature::query()->firstOrFail();
-        $this->assertSame('新北中通', $signature->organization_name);
+        $this->assertSame('新北中通快递有限公司', $signature->organization_name);
         $this->assertSame('李四', $signature->payload['new_account_name']);
         $this->assertSame('张经理', $signature->operator_name);
 
@@ -115,7 +115,7 @@ class CourierAgreementSignatureWorkflowTest extends FeatureTestCase
             }
 
             return data_get($request->data(), 'signers.0.signerType') === 1
-                && data_get($request->data(), 'signers.0.orgSignerInfo.orgName') === '新北中通'
+                && data_get($request->data(), 'signers.0.orgSignerInfo.orgName') === '新北中通快递有限公司'
                 && data_get($request->data(), 'signers.0.orgSignerInfo.transactorInfo.psnInfo.psnName') === '张经理'
                 && data_get($request->data(), 'signers.0.psnSignerInfo') === null;
         });
@@ -136,6 +136,21 @@ class CourierAgreementSignatureWorkflowTest extends FeatureTestCase
         Http::assertNothingSent();
     }
 
+    public function test_account_change_requires_counterparty_esign_organization_name(): void
+    {
+        $this->fakeEsign();
+        $payload = $this->accountChangePayload('request-missing-counterparty-organization');
+        unset($payload['counterparty_organization_name']);
+
+        $this->withExceptionHandling()
+            ->loginAs()
+            ->post(route('business.courier-agreement-signatures.store'), $payload)
+            ->assertSessionHasErrors('counterparty_organization_name');
+
+        $this->assertDatabaseCount('business_courier_agreement_signatures', 0);
+        Http::assertNothingSent();
+    }
+
     public function test_cooperation_contract_maps_party_variables_and_creates_two_signers(): void
     {
         $this->fakeEsign();
@@ -665,6 +680,7 @@ class CourierAgreementSignatureWorkflowTest extends FeatureTestCase
             'signing_deadline' => now()->addDays(7)->toDateString(),
             'esign_account' => '13800138000',
             'operator_name' => '张经理',
+            'counterparty_organization_name' => '新北中通快递有限公司',
             'archive_mode' => 'auto',
             'account_proof_effective_date' => now()->toDateString(),
             'account_proof_account_name' => '新北中通快递有限公司',
@@ -681,9 +697,11 @@ class CourierAgreementSignatureWorkflowTest extends FeatureTestCase
             'document_type' => 'account-change',
             'signing_subject' => $this->company->name,
             'company_full_name' => $this->company->name,
+            'signature_date' => '2026-09-21',
             'signing_deadline' => now()->addDays(7)->toDateString(),
             'esign_account' => '13800138000',
             'operator_name' => '张经理',
+            'counterparty_organization_name' => '新北中通快递有限公司',
             'archive_mode' => 'auto',
             'account_change_date' => now()->toDateString(),
             'old_account_name' => '新北中通快递有限公司',