diff --git a/app/Business/SystemizationTodoWorkbookImporter.php b/app/Business/SystemizationTodoWorkbookImporter.php
index e66f5d8d..d3b1e723 100644
--- a/app/Business/SystemizationTodoWorkbookImporter.php
+++ b/app/Business/SystemizationTodoWorkbookImporter.php
@@ -33,13 +33,18 @@ class SystemizationTodoWorkbookImporter
      *
      * @return array{created:int,skipped:int,sheet:string}
      */
-    public function import(string $path, int $companyId, ?int $userId = null): array
+    public function import(
+        string $path,
+        int $companyId,
+        ?int $userId = null,
+        ?string $originalName = null,
+    ): array
     {
         if (! is_file($path)) {
             throw new RuntimeException('找不到待办 Excel 文件。');
         }
 
-        $extension = strtolower(pathinfo($path, PATHINFO_EXTENSION));
+        $extension = $this->extension($path, $originalName);
         if ($extension !== 'xlsx') {
             throw new RuntimeException('系统化待办仅支持 .xlsx 文件。');
         }
@@ -120,13 +125,19 @@ class SystemizationTodoWorkbookImporter
      *
      * @return array{created:int,updated:int,retained:int,sheet:string}
      */
-    public function sync(string $path, int $companyId, ?int $userId = null, bool $dryRun = false): array
+    public function sync(
+        string $path,
+        int $companyId,
+        ?int $userId = null,
+        bool $dryRun = false,
+        ?string $originalName = null,
+    ): array
     {
         if (! is_file($path)) {
             throw new RuntimeException('找不到待办 Excel 文件。');
         }
 
-        $extension = strtolower(pathinfo($path, PATHINFO_EXTENSION));
+        $extension = $this->extension($path, $originalName);
         if ($extension !== 'xlsx') {
             throw new RuntimeException('系统化待办仅支持 .xlsx 文件。');
         }
@@ -721,6 +732,16 @@ class SystemizationTodoWorkbookImporter
         return trim(str_replace("\u{00A0}", ' ', (string) $value));
     }
 
+    private function extension(string $path, ?string $originalName): string
+    {
+        $name = trim((string) $originalName);
+        $extension = $name !== ''
+            ? pathinfo($name, PATHINFO_EXTENSION)
+            : pathinfo($path, PATHINFO_EXTENSION);
+
+        return strtolower((string) $extension);
+    }
+
     /**
      * @return array{0:string|null,1:string}
      */
diff --git a/app/Http/Controllers/Business/SystemizationTodos.php b/app/Http/Controllers/Business/SystemizationTodos.php
index 2205c5ec..f017371b 100644
--- a/app/Http/Controllers/Business/SystemizationTodos.php
+++ b/app/Http/Controllers/Business/SystemizationTodos.php
@@ -741,6 +741,8 @@ class SystemizationTodos extends Controller
                 $data['source']->getRealPath(),
                 (int) company_id(),
                 user_id(),
+                false,
+                $data['source']->getClientOriginalName(),
             );
         } catch (Throwable $exception) {
             report($exception);
diff --git a/tests/Feature/Business/SystemizationTodosTest.php b/tests/Feature/Business/SystemizationTodosTest.php
index a21e9fa8..9b7b7213 100644
--- a/tests/Feature/Business/SystemizationTodosTest.php
+++ b/tests/Feature/Business/SystemizationTodosTest.php
@@ -860,6 +860,53 @@ class SystemizationTodosTest extends FeatureTestCase
         }
     }
 
+    public function test_uploaded_workbook_uses_original_filename_when_temp_path_has_no_extension(): void
+    {
+        $this->loginAs();
+
+        $sourcePath = sys_get_temp_dir() . '/systemization-upload-source-' . uniqid() . '.xlsx';
+        $uploadPath = sys_get_temp_dir() . '/systemization-upload-' . uniqid();
+        try {
+            $this->writeWorkbook($sourcePath, [[
+                '收入',
+                '上传测试',
+                '浏览器上传的工作簿',
+                '晨曦',
+                '栎阳',
+                '2026-10-27',
+                '2026-10-30',
+                null,
+                null,
+            ]]);
+            copy($sourcePath, $uploadPath);
+
+            $upload = new UploadedFile(
+                $uploadPath,
+                '10.19工作梳理.xlsx',
+                'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+                null,
+                true,
+            );
+
+            $this->post(route('business.systemization-todos.import'), [
+                'source' => $upload,
+            ])->assertRedirect()
+                ->assertSessionHas('success');
+
+            $this->assertDatabaseHas('business_systemization_todos', [
+                'company_id' => (int) company_id(),
+                'title' => '浏览器上传的工作簿',
+            ]);
+            $this->assertDatabaseHas('business_systemization_todo_audit_logs', [
+                'company_id' => (int) company_id(),
+                'action' => 'import',
+            ]);
+        } finally {
+            @unlink($sourcePath);
+            @unlink($uploadPath);
+        }
+    }
+
     public function test_manual_changes_are_listed_in_operation_history_and_csv(): void
     {
         $this->loginAs();