diff --git a/server/http/base.go b/server/http/base.go
index 013c3c0..38e592e 100644
--- a/server/http/base.go
+++ b/server/http/base.go
@@ -27,6 +27,8 @@ func register(name string, f commondFunc) {
 	}
 	regCmds[name] = f
 }
+
 func lookup(name string) commondFunc {
 	return regCmds[strings.ToLower(name)]
+
 }
diff --git a/server/http/cmd_hash.go b/server/http/cmd_hash.go
index cf0955b..23fa3b2 100644
--- a/server/http/cmd_hash.go
+++ b/server/http/cmd_hash.go
@@ -172,10 +172,14 @@ func hkeysCommand(db *ledis.DB, args ...string) (interface{}, error) {
 		return nil, fmt.Errorf(ERR_ARGUMENT_FORMAT, "hkeys")
 	}
 	key := []byte(args[0])
-	if v, err := db.HKeys(key); err != nil {
+	if fields, err := db.HKeys(key); err != nil {
 		return nil, err
 	} else {
-		return v, nil
+		arr := make([]string, len(fields))
+		for i, f := range fields {
+			arr[i] = ledis.String(f)
+		}
+		return arr, nil
 	}
 }
 
@@ -303,4 +307,5 @@ func init() {
 	register("hexpireat", hexpireAtCommand)
 	register("httl", httlCommand)
 	register("hpersist", hpersistCommand)
+
 }
diff --git a/server/http/cmd_hash_test.go b/server/http/cmd_hash_test.go
new file mode 100644
index 0000000..c95fde1
--- /dev/null
+++ b/server/http/cmd_hash_test.go
@@ -0,0 +1,369 @@
+package http
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+func TestHSetCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hsetCommand(db, "test_hset")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hset") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	n, err := hsetCommand(db, "test_hset", "f", "v")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if n.(int64) != 1 {
+		t.Fatal("invalid result ", n)
+	}
+	v, err := db.HGet([]byte("test_hset"), []byte("f"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if string(v) != "v" {
+		t.Fatalf("invalid result %s", v)
+	}
+
+}
+
+func TestHGetCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hgetCommand(db, "test_hget")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hget") {
+		t.Fatalf("invalid err %v", err)
+	}
+	if _, err := db.HSet([]byte("test_hget"), []byte("f"), []byte("v")); err != nil {
+		t.Fatal(err.Error())
+	}
+
+	v, err := hgetCommand(db, "test_hget", "f")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if v.(string) != "v" {
+		t.Fatal("invalid result ", v)
+	}
+
+}
+
+func TestHExistsCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hexistsCommand(db, "test_hexists")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hexists") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	_, err = db.HSet([]byte("test_hexists"), []byte("f"), []byte("v"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	v, err := hexistsCommand(db, "test_hexists", "f")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	if v.(int64) != 1 {
+		t.Fatal("invalid result ", v)
+	}
+
+}
+
+func TestDelCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hdelCommand(db, "test_hdel")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hdel") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	_, err = db.HSet([]byte("test_hdel"), []byte("f"), []byte("v"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	v, err := hdelCommand(db, "test_hdel", "f")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if v.(int64) != 1 {
+		t.Fatal("invalid result ", v)
+	}
+
+	r, err := db.HGet([]byte("test_hdel"), []byte("f"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if r != nil {
+		t.Fatalf("invalid result %v", r)
+	}
+}
+
+func TestHLenCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hlenCommand(db, "test_hlen", "a")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hlen") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	_, err = db.HSet([]byte("test_hlen"), []byte("f1"), []byte("v1"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	_, err = db.HSet([]byte("test_hlen"), []byte("f2"), []byte("v2"))
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	v, err := hlenCommand(db, "test_hlen")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if v.(int64) != 2 {
+		t.Fatal("invalid result ", v)
+	}
+}
+
+func TestHIncrbyCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hincrbyCommand(db, "test_hincrby")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hincrby") {
+		t.Fatalf("invalid err %v", err)
+	}
+	_, err = db.HSet([]byte("test_hincrby"), []byte("f"), []byte("10"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	_, err = hincrbyCommand(db, "test_hincrby", "f", "x")
+	if err != ErrValue {
+		t.Fatal("invalid err ", err)
+	}
+
+	v, err := hincrbyCommand(db, "test_hincrby", "f", "10")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if v.(int64) != 20 {
+		t.Fatal("invalid result ", v)
+	}
+}
+
+func TestHMsetCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hmsetCommand(db, "test_hmset")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hmset") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	_, err = hmsetCommand(db, "test_hmset", "f1", "v1", "f2", "v2")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	v, err := db.HGet([]byte("test_hmset"), []byte("f1"))
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if string(v) != "v1" {
+		t.Fatalf("invalid result %s", v)
+	}
+
+	v, err = db.HGet([]byte("test_hmset"), []byte("f2"))
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if string(v) != "v2" {
+		t.Fatalf("invalid result %s", v)
+	}
+}
+
+func TestHMgetCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hmgetCommand(db, "test_hmget")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hmget") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	_, err = db.HSet([]byte("test_hmget"), []byte("f1"), []byte("v1"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	_, err = db.HSet([]byte("test_hmget"), []byte("f2"), []byte("v2"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	v, err := hmgetCommand(db, "test_hmget", "f1", "f2")
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	arr := v.([]interface{})
+	if len(arr) != 2 {
+		t.Fatalf("invalid arr %v", arr)
+	}
+	if arr[0].(string) != "v1" {
+		t.Fatal("invalid result ", v)
+	}
+
+	if arr[1].(string) != "v2" {
+		t.Fatal("invalid result ", v)
+	}
+}
+
+func TestHGetallCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hgetallCommand(db, "test_hgetall", "a")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hgetall") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	_, err = db.HSet([]byte("test_hgetall"), []byte("f"), []byte("v"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	v, err := hgetallCommand(db, "test_hgetall")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	m := v.(map[string]string)
+	if m["f"] != "v" {
+		t.Fatal("invalid result ", v)
+	}
+}
+
+func TestHKeysCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hkeysCommand(db, "test_hkeys", "a")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hkeys") {
+		t.Fatalf("invalid err %v", err)
+	}
+	_, err = db.HSet([]byte("test_hkeys"), []byte("f"), []byte("v"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	v, err := hkeysCommand(db, "test_hkeys")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	arr := v.([]string)
+	if arr[0] != "f" {
+		t.Fatal("invalid result ", v)
+	}
+
+}
+
+func TestHClearCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hclearCommand(db, "test_hclear", "a")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hclear") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	_, err = db.HSet([]byte("test_hclear"), []byte("f"), []byte("v"))
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	v, err := hclearCommand(db, "test_hclear")
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+
+	if v.(int64) != 1 {
+		t.Fatal("invalid result ", v)
+	}
+}
+
+func TestHMclearCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hmclearCommand(db)
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hmclear") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	v, err := hmclearCommand(db, "test_hmclear1", "test_hmclear2")
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if v.(int64) != 2 {
+		t.Fatal("invalid result ", v)
+	}
+}
+
+func TestHExpireCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hexpireCommand(db, "test_hexpire")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hexpire") {
+		t.Fatalf("invalid err %v", err)
+	}
+	v, err := hexpireCommand(db, "test_hexpire", "10")
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if v.(int64) != 0 {
+		t.Fatal("invalid result ", v)
+	}
+}
+
+func TestHExpireAtCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hexpireAtCommand(db, "test_hexpireat")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hexpireat") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	expireAt := fmt.Sprintf("%d", time.Now().Unix()+10)
+	v, err := hexpireCommand(db, "test_hexpireat", expireAt)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if v.(int64) != 0 {
+		t.Fatal("invalid result ", v)
+	}
+}
+
+func TestHTTLCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := httlCommand(db, "test_httl", "a")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "httl") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	v, err := httlCommand(db, "test_httl")
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if v.(int64) != -1 {
+		t.Fatal("invalid result ", v)
+	}
+}
+
+func TestHPersistCommand(t *testing.T) {
+	db := getTestDB()
+	_, err := hpersistCommand(db, "test_hpersist", "a")
+	if err == nil || err.Error() != fmt.Sprintf(ERR_ARGUMENT_FORMAT, "hpersist") {
+		t.Fatalf("invalid err %v", err)
+	}
+
+	v, err := hpersistCommand(db, "test_hpersist")
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if v.(int64) != 0 {
+		t.Fatal("invalid result ", v)
+	}
+}