diff --git a/core/mapreduce/mapreduce.go b/core/mr/mapreduce.go
similarity index 98%
rename from core/mapreduce/mapreduce.go
rename to core/mr/mapreduce.go
index c2c6ee95..f563b5bf 100644
--- a/core/mapreduce/mapreduce.go
+++ b/core/mr/mapreduce.go
@@ -1,4 +1,4 @@
-package mapreduce
+package mr
 
 import (
 	"errors"
@@ -16,7 +16,7 @@ const (
 	minWorkers     = 1
 )
 
-var ErrCancelWithNil = errors.New("mapreduce cancelled with nil")
+var ErrCancelWithNil = errors.New("mr cancelled with nil")
 
 type (
 	GenerateFunc    func(source chan<- interface{})
diff --git a/core/mapreduce/mapreduce_test.go b/core/mr/mapreduce_test.go
similarity index 99%
rename from core/mapreduce/mapreduce_test.go
rename to core/mr/mapreduce_test.go
index 153ff38e..50abd150 100644
--- a/core/mapreduce/mapreduce_test.go
+++ b/core/mr/mapreduce_test.go
@@ -1,4 +1,4 @@
-package mapreduce
+package mr
 
 import (
 	"errors"
diff --git a/example/mapreduce/countfunc/countfunc.go b/example/mapreduce/countfunc/countfunc.go
index beeff375..0fea993b 100644
--- a/example/mapreduce/countfunc/countfunc.go
+++ b/example/mapreduce/countfunc/countfunc.go
@@ -14,7 +14,7 @@ import (
 	"sync/atomic"
 	"time"
 
-	"zero/core/mapreduce"
+	"zero/core/mr"
 
 	"github.com/google/gops/agent"
 )
@@ -52,7 +52,7 @@ func enumerateLines(filename string) chan string {
 	return output
 }
 
-func mapper(filename interface{}, writer mapreduce.Writer, cancel func(error)) {
+func mapper(filename interface{}, writer mr.Writer, cancel func(error)) {
 	if len(*stopOnFile) > 0 && path.Base(filename.(string)) == *stopOnFile {
 		fmt.Printf("Stop on file: %s\n", *stopOnFile)
 		cancel(errors.New("stop on file"))
@@ -80,7 +80,7 @@ func mapper(filename interface{}, writer mapreduce.Writer, cancel func(error)) {
 	writer.Write(result)
 }
 
-func reducer(input <-chan interface{}, writer mapreduce.Writer, cancel func(error)) {
+func reducer(input <-chan interface{}, writer mr.Writer, cancel func(error)) {
 	var result int
 
 	for count := range input {
@@ -110,7 +110,7 @@ func main() {
 	fmt.Println("Processing, please wait...")
 
 	start := time.Now()
-	result, err := mapreduce.MapReduce(func(source chan<- interface{}) {
+	result, err := mr.MapReduce(func(source chan<- interface{}) {
 		filepath.Walk(*dir, func(fpath string, f os.FileInfo, err error) error {
 			if !f.IsDir() && path.Ext(fpath) == ".go" {
 				source <- fpath
diff --git a/example/mapreduce/finishvoid/finishvoid.go b/example/mapreduce/finishvoid/finishvoid.go
index 854b2c01..b1a3e960 100644
--- a/example/mapreduce/finishvoid/finishvoid.go
+++ b/example/mapreduce/finishvoid/finishvoid.go
@@ -4,14 +4,14 @@ import (
 	"fmt"
 	"time"
 
-	"zero/core/mapreduce"
+	"zero/core/mr"
 	"zero/core/timex"
 )
 
 func main() {
 	start := timex.Now()
 
-	mapreduce.FinishVoid(func() {
+	mr.FinishVoid(func() {
 		time.Sleep(time.Second)
 	}, func() {
 		time.Sleep(time.Second * 5)
@@ -20,7 +20,7 @@ func main() {
 	}, func() {
 		time.Sleep(time.Second * 6)
 	}, func() {
-		if err := mapreduce.Finish(func() error {
+		if err := mr.Finish(func() error {
 			time.Sleep(time.Second)
 			return nil
 		}, func() error {
diff --git a/example/mapreduce/flatmap/flatmap.go b/example/mapreduce/flatmap/flatmap.go
index afed5bf5..087e33f5 100644
--- a/example/mapreduce/flatmap/flatmap.go
+++ b/example/mapreduce/flatmap/flatmap.go
@@ -3,7 +3,7 @@ package main
 import (
 	"fmt"
 
-	"zero/core/mapreduce"
+	"zero/core/mr"
 )
 
 var (
@@ -18,13 +18,13 @@ var (
 
 func main() {
 	var allFriends []string
-	for v := range mapreduce.Map(func(source chan<- interface{}) {
+	for v := range mr.Map(func(source chan<- interface{}) {
 		for _, each := range persons {
 			source <- each
 		}
-	}, func(item interface{}, writer mapreduce.Writer) {
+	}, func(item interface{}, writer mr.Writer) {
 		writer.Write(friends[item.(string)])
-	}, mapreduce.WithWorkers(100)) {
+	}, mr.WithWorkers(100)) {
 		allFriends = append(allFriends, v.([]string)...)
 	}
 	fmt.Println(allFriends)
diff --git a/example/mapreduce/goroutineleak/leak.go b/example/mapreduce/goroutineleak/leak.go
index 0a6e43dc..a4d9d2f2 100644
--- a/example/mapreduce/goroutineleak/leak.go
+++ b/example/mapreduce/goroutineleak/leak.go
@@ -10,7 +10,7 @@ import (
 
 	"zero/core/lang"
 	"zero/core/logx"
-	"zero/core/mapreduce"
+	"zero/core/mr"
 	"zero/core/proc"
 )
 
@@ -47,17 +47,17 @@ func main() {
 		case <-done:
 			return
 		default:
-			mapreduce.MapReduce(func(source chan<- interface{}) {
+			mr.MapReduce(func(source chan<- interface{}) {
 				for i := 0; i < 100; i++ {
 					source <- i
 				}
-			}, func(item interface{}, writer mapreduce.Writer, cancel func(error)) {
+			}, func(item interface{}, writer mr.Writer, cancel func(error)) {
 				if item.(int) == 40 {
 					cancel(errors.New("any"))
 					return
 				}
 				writer.Write(item)
-			}, func(pipe <-chan interface{}, writer mapreduce.Writer, cancel func(error)) {
+			}, func(pipe <-chan interface{}, writer mr.Writer, cancel func(error)) {
 				list := make([]int, 0)
 				for p := range pipe {
 					list = append(list, p.(int))
diff --git a/example/mapreduce/irregular/irregular.go b/example/mapreduce/irregular/irregular.go
index 3cafa6e1..026c0e1d 100644
--- a/example/mapreduce/irregular/irregular.go
+++ b/example/mapreduce/irregular/irregular.go
@@ -4,15 +4,15 @@ import (
 	"fmt"
 	"time"
 
-	"zero/core/mapreduce"
+	"zero/core/mr"
 )
 
 func main() {
-	mapreduce.MapReduceVoid(func(source chan<- interface{}) {
+	mr.MapReduceVoid(func(source chan<- interface{}) {
 		for i := 0; i < 10; i++ {
 			source <- i
 		}
-	}, func(item interface{}, writer mapreduce.Writer, cancel func(error)) {
+	}, func(item interface{}, writer mr.Writer, cancel func(error)) {
 		i := item.(int)
 		if i == 0 {
 			time.Sleep(10 * time.Second)
diff --git a/tools/goctl/goctl.go b/tools/goctl/goctl.go
index 3ac594f6..3374933d 100644
--- a/tools/goctl/goctl.go
+++ b/tools/goctl/goctl.go
@@ -15,7 +15,7 @@ import (
 	"zero/core/hash"
 	"zero/core/lang"
 	"zero/core/logx"
-	"zero/core/mapreduce"
+	"zero/core/mr"
 	"zero/core/stringx"
 	"zero/tools/goctl/api/apigen"
 	"zero/tools/goctl/api/dartgen"
@@ -345,7 +345,7 @@ func main() {
 	logx.Disable()
 
 	done := make(chan lang.PlaceholderType)
-	mapreduce.FinishVoid(func() {
+	mr.FinishVoid(func() {
 		if os.Getenv(autoUpdate) != "off" && !stringx.Contains(os.Args, "-iu") {
 			update()
 		}