diff --git a/resources/views/admin/site_subscriptions/show.blade.php b/resources/views/admin/site_subscriptions/show.blade.php
index 8e6b616..e546e47 100644
--- a/resources/views/admin/site_subscriptions/show.blade.php
+++ b/resources/views/admin/site_subscriptions/show.blade.php
@@ -333,13 +333,32 @@
 
     <div class="card">
         <h3>BMPA 失败原因Top3</h3>
-        @php $bmpaFailedReasonStats = $bmpaFailedReasonStats ?? []; @endphp
+        @php
+            $bmpaFailedReasonStats = $bmpaFailedReasonStats ?? [];
+            // 避免 URL 过长/特殊字符破坏 query：原因过长则不生成 keyword 链接
+            $FAILED_REASON_KEYWORD_MAX_LEN = 80;
+        @endphp
         @if(count($bmpaFailedReasonStats) > 0)
             <div class="muted mt-6">
                 @foreach($bmpaFailedReasonStats as $item)
-                    @php $reason = (string) ($item['reason'] ?? ''); @endphp
+                    @php
+                        $reason = (string) ($item['reason'] ?? '');
+                        $reasonUrl = '';
+                        if ($reason !== '' && mb_strlen($reason) <= $FAILED_REASON_KEYWORD_MAX_LEN) {
+                            $reasonUrl = $makePlatformOrderUrl([
+                                'site_subscription_id' => $subscription->id,
+                                'bmpa_failed_only' => '1',
+                                'bmpa_error_keyword' => $reason,
+                            ]);
+                        }
+                    @endphp
                     <div>
-                        <a class="link" href="{!! $makePlatformOrderUrl(['site_subscription_id' => $subscription->id, 'bmpa_failed_only' => '1', 'bmpa_error_keyword' => $reason]) !!}">{{ $reason }}</a>
+                        @if($reasonUrl)
+                            <a class="link" href="{!! $reasonUrl !!}">{{ $reason }}</a>
+                        @else
+                            <span>{{ $reason }}</span>
+                            <span class="muted muted-xs">（原因过长，请复制到筛选框）</span>
+                        @endif
                         <span class="muted">（{{ $item['count'] }}）</span>
                     </div>
                 @endforeach
@@ -355,9 +374,24 @@
         @if(count($failedReasonStats) > 0)
             <div class="muted mt-6">
                 @foreach($failedReasonStats as $item)
-                    @php $reason = (string) ($item['reason'] ?? ''); @endphp
+                    @php
+                        $reason = (string) ($item['reason'] ?? '');
+                        $reasonUrl = '';
+                        if ($reason !== '' && mb_strlen($reason) <= $FAILED_REASON_KEYWORD_MAX_LEN) {
+                            $reasonUrl = $makePlatformOrderUrl([
+                                'site_subscription_id' => $subscription->id,
+                                'sync_status' => 'failed',
+                                'sync_error_keyword' => $reason,
+                            ]);
+                        }
+                    @endphp
                     <div>
-                        <a class="link" href="{!! $makePlatformOrderUrl(['site_subscription_id' => $subscription->id, 'sync_status' => 'failed', 'sync_error_keyword' => $reason]) !!}">{{ $reason }}</a>
+                        @if($reasonUrl)
+                            <a class="link" href="{!! $reasonUrl !!}">{{ $reason }}</a>
+                        @else
+                            <span>{{ $reason }}</span>
+                            <span class="muted muted-xs">（原因过长，请复制到筛选框）</span>
+                        @endif
                         <span class="muted">（{{ $item['count'] }}）</span>
                     </div>
                 @endforeach
diff --git a/tests/Feature/AdminSiteSubscriptionBmpaFailedReasonLongDoesNotRenderKeywordLinkTest.php b/tests/Feature/AdminSiteSubscriptionBmpaFailedReasonLongDoesNotRenderKeywordLinkTest.php
new file mode 100644
index 0000000..7444acd
--- /dev/null
+++ b/tests/Feature/AdminSiteSubscriptionBmpaFailedReasonLongDoesNotRenderKeywordLinkTest.php
@@ -0,0 +1,91 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use App\Models\SiteSubscription;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminSiteSubscriptionBmpaFailedReasonLongDoesNotRenderKeywordLinkTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_subscription_show_page_does_not_render_bmpa_keyword_link_when_reason_too_long(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'sub_bmpa_long_reason_01',
+            'name' => '订阅BMPA失败原因过长护栏测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $sub = SiteSubscription::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'status' => 'activated',
+            'source' => 'manual',
+            'subscription_no' => 'SUB_BMPA_LONG_REASON_0001',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'amount' => 10,
+            'starts_at' => now()->subDay(),
+            'ends_at' => now()->addMonth(),
+            'activated_at' => now()->subDay(),
+        ]);
+
+        $longReason = str_repeat('中', 120);
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'site_subscription_id' => $sub->id,
+            'created_by_admin_id' => 1,
+            'order_no' => 'PO_SUB_BMPA_LONG_REASON_0001',
+            'order_type' => 'renewal',
+            'status' => 'pending',
+            'payment_status' => 'unpaid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 0,
+            'placed_at' => now(),
+            'meta' => [
+                'batch_mark_paid_and_activate_error' => [
+                    'message' => $longReason,
+                    'at' => now()->toDateTimeString(),
+                    'admin_id' => 1,
+                ],
+            ],
+        ]);
+
+        $res = $this->get('/admin/site-subscriptions/' . $sub->id);
+        $res->assertOk();
+
+        $res->assertSee('BMPA 失败原因Top3');
+        $res->assertDontSee('bmpa_error_keyword=', false);
+        $res->assertSee('原因过长，请复制到筛选框', false);
+    }
+}
diff --git a/tests/Feature/AdminSiteSubscriptionBmpaFailedReasonStatsLinksTest.php b/tests/Feature/AdminSiteSubscriptionBmpaFailedReasonStatsLinksTest.php
index 8dd860c..a7a584f 100644
--- a/tests/Feature/AdminSiteSubscriptionBmpaFailedReasonStatsLinksTest.php
+++ b/tests/Feature/AdminSiteSubscriptionBmpaFailedReasonStatsLinksTest.php
@@ -105,6 +105,7 @@ class AdminSiteSubscriptionBmpaFailedReasonStatsLinksTest extends TestCase
         ]);
 
         $this->get('/admin/site-subscriptions/' . $sub->id)
+            ->assertOk()
             ->assertOk()
             ->assertSee('BMPA 失败原因Top3')
             ->assertSee('回执总额与应付金额不一致')
diff --git a/tests/Feature/AdminSiteSubscriptionSyncFailedReasonLongDoesNotRenderKeywordLinkTest.php b/tests/Feature/AdminSiteSubscriptionSyncFailedReasonLongDoesNotRenderKeywordLinkTest.php
new file mode 100644
index 0000000..80c8e6b
--- /dev/null
+++ b/tests/Feature/AdminSiteSubscriptionSyncFailedReasonLongDoesNotRenderKeywordLinkTest.php
@@ -0,0 +1,93 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use App\Models\SiteSubscription;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminSiteSubscriptionSyncFailedReasonLongDoesNotRenderKeywordLinkTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_subscription_show_page_does_not_render_sync_keyword_link_when_reason_too_long(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'sub_sync_long_reason_01',
+            'name' => '订阅同步失败原因过长护栏测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $sub = SiteSubscription::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'status' => 'activated',
+            'source' => 'manual',
+            'subscription_no' => 'SUB_SYNC_LONG_REASON_0001',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'amount' => 10,
+            'starts_at' => now()->subDay(),
+            'ends_at' => now()->addMonth(),
+            'activated_at' => now()->subDay(),
+        ]);
+
+        $longReason = str_repeat('错', 120);
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'site_subscription_id' => $sub->id,
+            'created_by_admin_id' => 1,
+            'order_no' => 'PO_SUB_SYNC_LONG_REASON_0001',
+            'order_type' => 'renewal',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now(),
+            'paid_at' => now(),
+            'activated_at' => now(),
+            'meta' => [
+                'subscription_activation_error' => [
+                    'message' => $longReason,
+                    'at' => now()->toDateTimeString(),
+                    'admin_id' => 1,
+                ],
+            ],
+        ]);
+
+        $res = $this->get('/admin/site-subscriptions/' . $sub->id);
+        $res->assertOk();
+
+        $res->assertSee('同步失败原因Top3');
+        $res->assertDontSee('sync_error_keyword=', false);
+        $res->assertSee('原因过长，请复制到筛选框', false);
+    }
+}