diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index 9040bcb..11ddbfe 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -1,4 +1,5 @@
 # 本地仅起 PostgreSQL + MinIO；FastAPI 在宿主机跑（如 ./start.sh、uv run uvicorn）。
+# 基础镜像经 DaoCloud 公开镜像（大陆可访问）：docker.io → docker.m.daocloud.io
 #
 #   docker compose -f docker-compose.dev.yml up -d
 #
@@ -8,7 +9,7 @@
 
 services:
   db:
-    image: postgres:16-alpine
+    image: docker.m.daocloud.io/library/postgres:16-alpine
     environment:
       POSTGRES_USER: ${POSTGRES_USER:-postgres}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}
@@ -26,7 +27,7 @@ services:
 
   # S3 兼容：语音确认原始 WAV；与本项目 .env 中 MINIO_ACCESS_KEY / MINIO_SECRET_KEY 一致
   minio:
-    image: minio/minio:latest
+    image: docker.m.daocloud.io/minio/minio:latest
     command: server /data --console-address ":9001"
     environment:
       MINIO_ROOT_USER: ${MINIO_ACCESS_KEY:-minioadmin}
diff --git a/docker-compose.prod.yml b/docker-compose.prod.yml
index 41f652a..72ac16c 100644
--- a/docker-compose.prod.yml
+++ b/docker-compose.prod.yml
@@ -1,6 +1,9 @@
 # Production stack for the current codebase: FastAPI + PostgreSQL.
 # The API hard-fails on startup if the database is not reachable, so DB health is required.
 #
+# Base images use DaoCloud public mirror (大陆可访问): docker.io → docker.m.daocloud.io
+# See https://github.com/DaoCloud/public-image-mirror
+#
 # Published API port defaults to 38080 on the host (override with API_PORT).
 #
 # GPU (NVIDIA) inference: uv.lock pins torch/torchvision from the PyTorch *CPU* index (see pyproject.toml).
@@ -8,7 +11,7 @@
 # and assign GPUs to the api service (deploy.resources.reservations.devices).
 services:
   db:
-    image: postgres:16-alpine
+    image: docker.m.daocloud.io/library/postgres:16-alpine
     environment:
       POSTGRES_USER: ${POSTGRES_USER:-postgres}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD}