diff --git a/bilibili/aceld/goroutine/channel/test1/main.go b/bilibili/aceld/goroutine/channel/test1/main.go
index 33677de..9676d77 100644
--- a/bilibili/aceld/goroutine/channel/test1/main.go
+++ b/bilibili/aceld/goroutine/channel/test1/main.go
@@ -9,11 +9,11 @@ func main() {
 	go func() {
 		defer fmt.Println("goroutine 结束")
 		fmt.Println("goroutine 正在运行...")
-		// 将值发送给c
+		// go程中：将值发送给c
 		c <- 666
 	}()
 
-	// 读c中的数据并赋值给num
+	// 主线程中：读c中的数据并赋值给num
 	num := <-c
 	fmt.Println("num = ", num)
 	fmt.Println("main goroutine 结束 ...")
diff --git a/bilibili/aceld/goroutine/channel/test2/main.go b/bilibili/aceld/goroutine/channel/test2/main.go
new file mode 100644
index 0000000..77b5f40
--- /dev/null
+++ b/bilibili/aceld/goroutine/channel/test2/main.go
@@ -0,0 +1,35 @@
+// 有缓冲的channel
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	c := make(chan int, 3) // 带有缓冲的channel
+
+	fmt.Println("len(c) = ", len(c), ", cap(c) = ", cap(c))
+
+	// 做一个go程
+	go func() {
+		defer fmt.Println("子go程结束")
+		// 如果循环3将不会阻塞，大于3就会阻塞
+		for i := 0; i < 4; i++ {
+			// 把i传递给channel
+			c <- i
+			fmt.Println("子go程正在运行, 发送元素: ", i, ", len(c) = ", len(c), ", cap(c) = ", cap(c))
+		}
+	}()
+
+	time.Sleep(2 * time.Second)
+
+	for i := 0; i < 4; i++ {
+		num := <-c
+		fmt.Println("num = ", num)
+		// 如果这里不阻塞的话，那么子go程在第2轮之后有可能不会打印
+		time.Sleep(1 * time.Second)
+	}
+
+	fmt.Println("主进程main结束")
+}
diff --git a/bilibili/aceld/goroutine/channel/test3/main.go b/bilibili/aceld/goroutine/channel/test3/main.go
new file mode 100644
index 0000000..d7b3c56
--- /dev/null
+++ b/bilibili/aceld/goroutine/channel/test3/main.go
@@ -0,0 +1,27 @@
+package main
+
+import "fmt"
+
+func main() {
+	c := make(chan int)
+
+	go func() {
+		for i := 0; i < 5; i++ {
+			c <- i
+		}
+		// close可以关闭一个channel
+		close(c)
+	}()
+
+	for {
+		// 如果ok为true表示channel没有关闭，如果ok为false表示channel已经关闭
+		if data, ok := <-c; ok {
+			fmt.Println(data)
+		} else {
+			fmt.Println("channel c 已被关闭")
+			break
+		}
+	}
+
+	fmt.Println("Main finished ...")
+}
diff --git a/bilibili/aceld/goroutine/channel/test4/main.go b/bilibili/aceld/goroutine/channel/test4/main.go
new file mode 100644
index 0000000..bc7bd0d
--- /dev/null
+++ b/bilibili/aceld/goroutine/channel/test4/main.go
@@ -0,0 +1,20 @@
+package main
+
+import "fmt"
+
+func main() {
+	c := make(chan int)
+
+	go func() {
+		for i := 0; i < 5; i++ {
+			c <- i
+		}
+		close(c)
+	}()
+
+	for data := range c {
+		fmt.Println(data)
+	}
+
+	fmt.Println("Main finished ...")
+}