diff --git a/backend/services/docker-compose.snapshot.yml b/backend/services/docker-compose.snapshot.yml
index 3c053116..08e75628 100644
--- a/backend/services/docker-compose.snapshot.yml
+++ b/backend/services/docker-compose.snapshot.yml
@@ -16,7 +16,7 @@ services:
       - APP_PORT=3099
       - DATABASE_URL=file:/app/data/snapshot.db
       # PostgreSQL (备份目标 - 主业务库)
-      - PG_HOST=postgres
+      - PG_HOST=rwa-postgres
       - PG_PORT=5432
       - PG_USER=${POSTGRES_USER:-rwa_user}
       - PG_PASSWORD=${POSTGRES_PASSWORD}