diff --git a/buf/bytes_queue.go b/async/bytes_queue.go
similarity index 97%
rename from buf/bytes_queue.go
rename to async/bytes_queue.go
index 0dd5cf8..a86bbe9 100644
--- a/buf/bytes_queue.go
+++ b/async/bytes_queue.go
@@ -1,4 +1,4 @@
-package buf
+package async
 
 import (
 	"container/list"
diff --git a/async/iface_queue.go b/async/iface_queue.go
new file mode 100644
index 0000000..fdc835e
--- /dev/null
+++ b/async/iface_queue.go
@@ -0,0 +1,36 @@
+package async
+
+import (
+	"container/list"
+)
+
+// 블럭되지 않는 큐체널
+func NewQueue() (chan<- interface{}, <-chan interface{}) {
+	send := make(chan interface{}, 1)
+	receive := make(chan interface{}, 1)
+	go manageQueue(send, receive)
+	return send, receive
+}
+
+func manageQueue(send <-chan interface{}, receive chan<- interface{}) {
+	queue := list.New()
+	defer close(receive)
+	for {
+		if front := queue.Front(); front == nil {
+			if value, ok := <-send; ok {
+				queue.PushBack(value)
+			} else {
+				break
+			}
+		} else {
+			select {
+			case receive <- front.Value.(interface{}):
+				queue.Remove(front)
+			case value, ok := <-send:
+				if ok {
+					queue.PushBack(value)
+				}
+			}
+		}
+	}
+}
diff --git a/buf/string_queue.go b/async/string_queue.go
similarity index 97%
rename from buf/string_queue.go
rename to async/string_queue.go
index 1be0f61..ca16710 100644
--- a/buf/string_queue.go
+++ b/async/string_queue.go
@@ -1,4 +1,4 @@
-package buf
+package async
 
 import (
 	"container/list"