diff --git a/modules/EcommerceFinance/Services/DingProcessDetailMirrorSynchronizer.php b/modules/EcommerceFinance/Services/DingProcessDetailMirrorSynchronizer.php
index 1d66108a..5f11a08b 100644
--- a/modules/EcommerceFinance/Services/DingProcessDetailMirrorSynchronizer.php
+++ b/modules/EcommerceFinance/Services/DingProcessDetailMirrorSynchronizer.php
@@ -205,6 +205,9 @@ class DingProcessDetailMirrorSynchronizer
             $extracted['metrics']['approval_api_cursor'] = (string) (
                 $cursor['approval_api_cursor'] ?? ''
             );
+            $extracted['metrics']['scheme_high_watermark'] = (int) (
+                $cursor['scheme_high_watermark'] ?? 0
+            );
 
             if ($dryRun) {
                 return [
diff --git a/tests/Unit/EcommerceFinance/DingProcessDetailMirrorSynchronizerTest.php b/tests/Unit/EcommerceFinance/DingProcessDetailMirrorSynchronizerTest.php
index d02c9aaa..2d63744a 100644
--- a/tests/Unit/EcommerceFinance/DingProcessDetailMirrorSynchronizerTest.php
+++ b/tests/Unit/EcommerceFinance/DingProcessDetailMirrorSynchronizerTest.php
@@ -396,6 +396,49 @@ class DingProcessDetailMirrorSynchronizerTest extends TestCase
             ->table('ding_process_payment_mirror')->count());
     }
 
+    public function test_business_id_sync_preserves_incremental_watermarks(): void
+    {
+        $workflow = [
+            'processInstanceId' => 'process-preserve-cursors',
+            'processCode' => 'PROC-ACF09A14-B094-46B1-A9E2-8BB1F4E1FDCF',
+            'businessId' => '202610151743000310228',
+            'title' => '李斯提交的线上代发业务报销',
+            'status' => 'RUNNING',
+            'originatorUserId' => 'user-1',
+            'joinAt' => '2026-10-15 17:44:06',
+            'updateAt' => '2026-10-15 17:44:06',
+        ];
+        $this->query->workflows = [$workflow];
+        $this->query->scheme = [
+            '收款费用明细' => json_encode([[
+                'rowValue' => [['label' => '代发订单金额', 'value' => '100.00']],
+            ]], JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR),
+            '收款合计' => 100,
+            '付款明细' => '[]',
+        ];
+        $this->query->schemeHighWatermark = 500;
+        $this->synchronizer->sync(true);
+
+        $state = DB::connection('business_mirror')
+            ->table('business_mirror_table_states')
+            ->first();
+        $cursor = json_decode((string) $state->cursor, true);
+        $cursor['scheme_high_watermark'] = 500;
+        $cursor['approval_api_cursor'] = 'api-cursor-500';
+        DB::connection('business_mirror')
+            ->table('business_mirror_table_states')
+            ->update(['cursor' => json_encode($cursor, JSON_UNESCAPED_UNICODE)]);
+
+        $this->synchronizer->syncBusinessIds(['202610151743000310228']);
+
+        $state = DB::connection('business_mirror')
+            ->table('business_mirror_table_states')
+            ->first();
+        $cursor = json_decode((string) $state->cursor, true);
+        $this->assertSame(500, (int) $cursor['scheme_high_watermark']);
+        $this->assertSame('api-cursor-500', $cursor['approval_api_cursor']);
+    }
+
     /** @return array<string,mixed> */
     private function daifaScheme(): array
     {