diff --git a/lesson01/main.go b/lesson01/main.go
new file mode 100644
index 0000000..5d7056f
--- /dev/null
+++ b/lesson01/main.go
@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+func main() {
+	t := 0
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	rows := r.Intn(100)
+	for x := 1; x <= rows; x++ {
+		if x > rows/2 {
+			t--
+		} else {
+			t++
+		}
+		for y := 0; y < t; y++ {
+			fmt.Print("*")
+		}
+		fmt.Print("\n")
+	}
+}
diff --git a/lesson01/readme.md b/lesson01/readme.md
new file mode 100644
index 0000000..4ac3cfe
--- /dev/null
+++ b/lesson01/readme.md
@@ -0,0 +1 @@
+流程控制学习
\ No newline at end of file