diff --git a/Demo/Dockerfile.CMD b/Demo/Dockerfile.CMD
index 141641b..d92548f 100644
--- a/Demo/Dockerfile.CMD
+++ b/Demo/Dockerfile.CMD
@@ -1,5 +1,5 @@
-# 注释: Dockerfile RUN指令
-FROM nginx
+# 注释: Dockerfile CMD指令
+FROM busybox
 WORKDIR /app
 
 # 注意：只执行最后一个CMD
diff --git a/Demo/Dockerfile.CMD2 b/Demo/Dockerfile.CMD2
new file mode 100644
index 0000000..c7a2c06
--- /dev/null
+++ b/Demo/Dockerfile.CMD2
@@ -0,0 +1,18 @@
+# 注释: Dockerfile CMD指令,NGINX后台服务例子
+FROM nginx
+
+# 变参
+CMD ["nginx.conf"]
+# 定参
+ENTRYPOINT ["nginx", "-c"] 
+
+# docker build --rm -f Dockerfile.CMD2 -t study:buildcmd.nginx1 .
+
+# 不传参运行
+# docker run -d study:buildcmd.nginx1
+# 容器内会默认运行以下命令，启动主进程 nginx -c /etc/nginx/nginx.conf
+
+# 传参运行
+# docker run  study:buildcmd.nginx1 -c /etc/nginx/new.conf
+# 容器内会默认运行以下命令，启动主进程(/etc/nginx/new.conf:假设容器内已有此文件)
+# nginx -c /etc/nginx/new.conf
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