diff --git a/backend/crates/gateway-store/src/postgres/proxies.rs b/backend/crates/gateway-store/src/postgres/proxies.rs
index f92ef58e9..76c5280d7 100644
--- a/backend/crates/gateway-store/src/postgres/proxies.rs
+++ b/backend/crates/gateway-store/src/postgres/proxies.rs
@@ -441,10 +441,18 @@ impl ProxyStore for PgProxyRepository {
         if !acquired {
             return Err(store_error(conflict(id)));
         }
-        let record = self.get(id).await?;
-        if !record.last_test.is_some_and(|test| test.success) {
-            return Err(store_error(conflict(id)));
-        }
+        let record = match self.get(id).await {
+            Ok(record) if record.last_test.as_ref().is_some_and(|test| test.success) => record,
+            result => {
+                // 拒绝预留时先等待数据库释放锁，避免连接关闭尚未生效就误挡后续代理操作。
+                sqlx::query("select pg_advisory_unlock_shared(hashtextextended($1, 739219))")
+                    .bind(id)
+                    .execute(&mut connection)
+                    .await
+                    .map_err(|_| store_error(unavailable()))?;
+                return Err(result.err().unwrap_or_else(|| store_error(conflict(id))));
+            }
+        };
         Ok(ProxyImportReservation {
             binding: ImportProxyBinding {
                 id: record.id,
diff --git a/backend/crates/gateway-store/tests/postgres/proxies.rs b/backend/crates/gateway-store/tests/postgres/proxies.rs
index c81b87d64..901e0a30f 100644
--- a/backend/crates/gateway-store/tests/postgres/proxies.rs
+++ b/backend/crates/gateway-store/tests/postgres/proxies.rs
@@ -473,6 +473,47 @@ async fn proxy_accounts_paginate_thousands_of_accounts_and_search_without_loadin
     database.close().await;
 }
 
+#[tokio::test]
+async fn rejected_import_reservations_release_proxy_lock_before_returning() {
+    let Some(database) = TestDatabase::create("rejected_proxy_import").await else {
+        return;
+    };
+    let store = PgProxyRepository::new(database.pool.clone());
+    let other_process = PgProxyRepository::new(database.pool.clone());
+    let context = context();
+    let saved = store
+        .create(
+            NewProxy {
+                location: None,
+                name: "未通过检测的出口".to_owned(),
+                proxy: OutboundProxy::parse("http://127.0.0.1:8080").unwrap(),
+            },
+            &context,
+        )
+        .await
+        .unwrap()
+        .record;
+
+    // 每次失败后立即写入检测结果，不等待连接关闭或重试锁冲突。
+    for _ in 0..64 {
+        let error = store.reserve_import(&saved.id).await.err().unwrap();
+        assert_eq!(error.kind(), AdminStoreErrorKind::Conflict);
+        other_process
+            .record_test(
+                &saved.id,
+                saved.revision,
+                ProxyTestResult {
+                    success: false,
+                    ..success()
+                },
+                &context,
+            )
+            .await
+            .unwrap();
+    }
+    database.close().await;
+}
+
 #[tokio::test]
 async fn import_reservation_blocks_proxy_mutations_until_rotated_credentials_are_committed() {
     use gateway_store::postgres::{