diff --git a/pkg/cloudcommon/db/standalone.go b/pkg/cloudcommon/db/standalone.go
index 45bbfd5716..88702015c3 100644
--- a/pkg/cloudcommon/db/standalone.go
+++ b/pkg/cloudcommon/db/standalone.go
@@ -5,6 +5,7 @@ import (
 	"database/sql"
 	"fmt"
 	"strings"
+	"unicode"
 
 	"yunion.io/x/jsonutils"
 	"yunion.io/x/log"
@@ -279,8 +280,10 @@ func (model *SStandaloneResourceBase) PerformMetadata(ctx context.Context, userC
 }
 
 func (model *SStandaloneResourceBase) ValidateMetadataKey(key string) error {
-	if strings.HasPrefix(key, CLOUD_TAG_PREFIX) || strings.ContainsAny(key, `:=#&?$/\`) {
-		return httperrors.NewInputParameterError(`key cannot start with %s and not contain :=#&?$/\`, CLOUD_TAG_PREFIX)
+	for _, k := range []rune(key) {
+		if k != rune('_') && !unicode.IsLetter(k) && !unicode.IsDigit(k) {
+			return httperrors.NewInputParameterError(`Not support tag key with %s`, string(k))
+		}
 	}
 	return nil
 }
diff --git a/pkg/mcclient/options/base.go b/pkg/mcclient/options/base.go
index af622c7347..f6fdb6cabd 100644
--- a/pkg/mcclient/options/base.go
+++ b/pkg/mcclient/options/base.go
@@ -3,7 +3,9 @@ package options
 import (
 	"fmt"
 	"reflect"
+	"strings"
 	"time"
+	"unicode"
 
 	"yunion.io/x/jsonutils"
 	"yunion.io/x/pkg/gotypes"
@@ -186,8 +188,7 @@ type BaseListOptions struct {
 	ExportFile       string   `help:"Export to file" metavar:"<EXPORT_FILE_PATH>" json:"-"`
 	ExportKeys       string   `help:"Export field keys"`
 	ExportTexts      string   `help:"Export field displayname texts" json:"-"`
-	TagsKey          []string `help:"Tag key" json:"-"`
-	TagsValue        []string `help:"Tag key" json:"-"`
+	Tags             []string `help:"Tags info, eg: hypervisor=aliyun、os_type=Linux、os_version"`
 
 	Manager      string `help:"List objects belonging to the cloud provider" json:"manager,omitempty"`
 	Account      string `help:"List objects belonging to the cloud account" json:"account,omitempty"`
@@ -219,13 +220,23 @@ func (opts *BaseListOptions) Params() (*jsonutils.JSONDict, error) {
 			params.Set("admin", jsonutils.JSONTrue)
 		}
 	}
-	if len(opts.TagsKey) > 0 {
-		for i := 0; i < len(opts.TagsKey); i++ {
-			params.Add(jsonutils.NewString(opts.TagsKey[i]), fmt.Sprintf("tags.%d.key", i))
-			if len(opts.TagsValue) > i {
-				params.Add(jsonutils.NewString(opts.TagsValue[i]), fmt.Sprintf("tags.%d.value", i))
+	for idx, tag := range opts.Tags {
+		tagInfo := strings.Split(tag, "=")
+		if len(tagInfo) > 2 {
+			return nil, fmt.Errorf("failed parse tags info %s", tag)
+		}
+		if len(tagInfo[0]) == 0 {
+			return nil, fmt.Errorf("Not support empty key")
+		}
+		for _, k := range tagInfo[0] {
+			if k != rune('_') && !unicode.IsLetter(k) && !unicode.IsDigit(k) {
+				return nil, fmt.Errorf("Not support tag key with %s", string(k))
 			}
 		}
+		params.Add(jsonutils.NewString(tagInfo[0]), fmt.Sprintf("tags.%d.key", idx))
+		if len(tagInfo) == 2 {
+			params.Add(jsonutils.NewString(tagInfo[1]), fmt.Sprintf("tags.%d.value", idx))
+		}
 	}
 	return params, nil
 }