diff --git a/config/credential/Credential.go b/config/credential/Credential.go
index b09c7c4..23ab028 100644
--- a/config/credential/Credential.go
+++ b/config/credential/Credential.go
@@ -3,6 +3,7 @@ package credential
 import (
 	"encoding/json"
 	"errors"
+	"reflect"
 
 	"git.loafle.net/overflow/model/meta"
 )
@@ -10,35 +11,45 @@ import (
 type Credential struct {
 }
 
-type CredentialMap map[string]*Credential
+// CredentialsMap is map of array of Credential
+type CredentialsMap map[string]interface{}
 
-func (m *CredentialMap) UnmarshalJSON(data []byte) error {
+func (m *CredentialsMap) UnmarshalJSON(data []byte) error {
 	credentials := make(map[string]json.RawMessage)
 	err := json.Unmarshal(data, &credentials)
 	if nil != err {
 		return err
 	}
 
-	result := make(CredentialMap)
+	result := make(CredentialsMap)
 	for k, v := range credentials {
 		var i interface{}
-
 		switch meta.ToMetaCredentialTypeEnum(&meta.MetaCredentialType{Key: k}) {
 		case meta.MetaCredentialTypeEnumSNMP:
-			i = &SNMPCredential{}
+			var _i []*SNMPCredential
+			i = &_i
 		case meta.MetaCredentialTypeEnumWindows:
-			i = &WindowsCredential{}
+			var _i []*WindowsCredential
+			i = &_i
 		default:
 			return errors.New("Unrecognized Credential")
 		}
 
-		err := json.Unmarshal(v, i)
+		err := json.Unmarshal(v, &i)
 		if nil != err {
 			return err
 		}
-		result[k] = i.(*Credential)
+		result[k] = reflect.ValueOf(i).Elem().Interface()
 	}
 	*m = result
 
 	return nil
 }
+
+func unmarshalJSON(v json.RawMessage, i interface{}) error {
+	err := json.Unmarshal(v, &i)
+	if nil != err {
+		return err
+	}
+	return nil
+}
diff --git a/config/credential/Credential_test.go b/config/credential/Credential_test.go
new file mode 100644
index 0000000..86449cf
--- /dev/null
+++ b/config/credential/Credential_test.go
@@ -0,0 +1,69 @@
+package credential
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestCredentialsMap_UnmarshalJSON(t *testing.T) {
+	credentialsMap := CredentialsMap{
+		"SNMP": []*SNMPCredential{
+			&SNMPCredential{
+				Version:   "2c",
+				Community: "public",
+			},
+			&SNMPCredential{
+				Version:   "2c",
+				Community: "atgame",
+			},
+		},
+		"WINDOWS": []*WindowsCredential{
+			&WindowsCredential{
+				DomainName: "atgame.net",
+				User:       "crusader",
+				Password:   "1234",
+			},
+		},
+	}
+
+	b, err := json.Marshal(credentialsMap)
+	if nil != err {
+		t.Errorf("CredentialsMap.UnmarshalJSON() error = %v", err)
+	}
+
+	_credentialsMap := CredentialsMap{}
+
+	type args struct {
+		data []byte
+	}
+	tests := []struct {
+		name    string
+		m       CredentialsMap
+		args    args
+		wantErr bool
+	}{
+		{
+			name: "1",
+			m:    _credentialsMap,
+			args: args{
+				data: b,
+			},
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := tt.m.UnmarshalJSON(tt.args.data); (err != nil) != tt.wantErr {
+				t.Errorf("CredentialsMap.UnmarshalJSON() error = %v, wantErr %v", err, tt.wantErr)
+			}
+			cs := tt.m["SNMP"].([]*SNMPCredential)
+			for _, c := range cs {
+				t.Log(c)
+			}
+			cs1 := tt.m["WINDOWS"].([]*WindowsCredential)
+			for _, c1 := range cs1 {
+				t.Log(c1)
+			}
+		})
+	}
+}
diff --git a/config/credential/SNMPCredential.go b/config/credential/SNMPCredential.go
index ce42ae5..e34d5bd 100644
--- a/config/credential/SNMPCredential.go
+++ b/config/credential/SNMPCredential.go
@@ -4,6 +4,7 @@ import "encoding/json"
 
 type SNMPCredential struct {
 	Credential
+
 	Version            string      `json:"version,omitempty"`
 	Community          string      `json:"community,omitempty"`
 	AuthenticationType string      `json:"authenticationType,omitempty"`
diff --git a/config/credential/UnixCredential.go b/config/credential/UnixCredential.go
index 85e6a77..68e9121 100644
--- a/config/credential/UnixCredential.go
+++ b/config/credential/UnixCredential.go
@@ -4,6 +4,7 @@ import "encoding/json"
 
 type UnixCredential struct {
 	Credential
+
 	User                   string      `json:"user,omitempty"`
 	LoginType              string      `json:"loginType,omitempty"`
 	Password               string      `json:"password,omitempty"`
diff --git a/config/credential/WindowsCredential.go b/config/credential/WindowsCredential.go
index 81bac02..50b1e34 100644
--- a/config/credential/WindowsCredential.go
+++ b/config/credential/WindowsCredential.go
@@ -2,6 +2,7 @@ package credential
 
 type WindowsCredential struct {
 	Credential
+
 	DomainName string `json:"domainName,omitempty"`
 	User       string `json:"user,omitempty"`
 	Password   string `json:"password,omitempty"`