diff --git a/internal/collections/infra/mysql_repo.go b/internal/collections/infra/mysql_repo.go
index 2eed1502..5b1f82c9 100644
--- a/internal/collections/infra/mysql_repo.go
+++ b/internal/collections/infra/mysql_repo.go
@@ -308,11 +308,7 @@ func (r mysqlRepo) reCountSubjectTags(ctx context.Context, tx *query.Query,
 	var countMap = make(map[string]uint32)
 
 	for _, tag := range tagList {
-		if len(tag.Tag.Name) == 0 {
-			continue
-		}
-
-		if dam.ZeroWithPattern.MatchString(tag.Tag.Name) {
+		if !dam.ValidateTag(tag.Tag.Name) {
 			continue
 		}
 
diff --git a/internal/pkg/dam/dam.go b/internal/pkg/dam/dam.go
index 6191fb02..ac525dab 100644
--- a/internal/pkg/dam/dam.go
+++ b/internal/pkg/dam/dam.go
@@ -97,4 +97,21 @@ func AllPrintableChar(text string) bool {
 	return true
 }
 
-var ZeroWithPattern = regexp.MustCompile(`\p{Cf}|\p{Cc}|\p{Co}`)
+var ZeroWidthPattern = regexp.MustCompile(`\p{Cf}|\p{Cc}|\p{Co}`)
+var ExtraSpacePattern = regexp.MustCompile("[\u3000 ]")
+
+func ValidateTag(t string) bool {
+	if len(t) == 0 {
+		return false
+	}
+
+	if !AllPrintableChar(t) {
+		return false
+	}
+
+	if ExtraSpacePattern.MatchString(t) {
+		return false
+	}
+
+	return true
+}
diff --git a/web/req/collection.go b/web/req/collection.go
index 8e419369..c2c6e360 100644
--- a/web/req/collection.go
+++ b/web/req/collection.go
@@ -15,11 +15,10 @@
 package req
 
 import (
+	"fmt"
 	"strings"
 	"unicode/utf8"
 
-	"github.com/samber/lo"
-
 	"github.com/bangumi/server/internal/collections/domain/collection"
 	"github.com/bangumi/server/internal/pkg/dam"
 	"github.com/bangumi/server/internal/pkg/null"
@@ -47,15 +46,9 @@ func (v *SubjectEpisodeCollectionPatch) Validate() error {
 		}
 	}
 
-	if len(v.Tags) > 0 {
-		if !lo.EveryBy(v.Tags, dam.AllPrintableChar) {
-			return res.BadRequest("invisible character are included in tags")
-		}
-
-		if lo.ContainsBy(v.Tags, func(item string) bool {
-			return len(item) == 0
-		}) {
-			return res.BadRequest("zero length tags are included in tags")
+	for _, tag := range v.Tags {
+		if !dam.ValidateTag(tag) {
+			return res.BadRequest(fmt.Sprintf("invalid tag: %q", tag))
 		}
 	}