diff --git a/day03/src/com/inmind/Demo05_dowhile.java b/day03/src/com/inmind/Demo05_dowhile.java
new file mode 100644
index 0000000..80810cc
--- /dev/null
+++ b/day03/src/com/inmind/Demo05_dowhile.java
@@ -0,0 +1,29 @@
+package com.inmind;
+/*
+Do_While格式和使用
+
+循环变量初始化①
+do{
+	循环体语句③
+	修改循环变量④
+}while(循环条件②);
+
+do-while上来不管怎样肯定会执行一次循环体语句
+
+执行顺序：①③④>②③④>②③④…②不满足为止。
+*/
+public class Demo05_dowhile {
+    public static void main(String[] args) {
+        //打印1~10
+        int i = 1;
+        do{
+            System.out.println(i);
+            i++;
+        }while(i<=10);
+        System.out.println("程序结束");
+
+        //10~1
+        //a~z
+
+    }
+}