diff --git a/component/trie/domain.go b/component/trie/domain.go
index 87dfeda60..574a59caa 100644
--- a/component/trie/domain.go
+++ b/component/trie/domain.go
@@ -3,6 +3,8 @@ package trie
 import (
 	"errors"
 	"strings"
+	"unicode"
+	"unicode/utf8"
 )
 
 const (
@@ -25,6 +27,14 @@ func ValidAndSplitDomain(domain string) ([]string, bool) {
 	if domain != "" && domain[len(domain)-1] == '.' {
 		return nil, false
 	}
+	if domain != "" {
+		if r, _ := utf8.DecodeRuneInString(domain); unicode.IsSpace(r) {
+			return nil, false
+		}
+		if r, _ := utf8.DecodeLastRuneInString(domain); unicode.IsSpace(r) {
+			return nil, false
+		}
+	}
 	domain = strings.ToLower(domain)
 	parts := strings.Split(domain, domainStep)
 	if len(parts) == 1 {
diff --git a/component/trie/domain_test.go b/component/trie/domain_test.go
index 916f61076..6aab72d3a 100644
--- a/component/trie/domain_test.go
+++ b/component/trie/domain_test.go
@@ -127,3 +127,14 @@ func TestTrie_Foreach(t *testing.T) {
 	})
 	assert.Equal(t, 7, count)
 }
+
+func TestTrie_Space(t *testing.T) {
+	validDomain := func(domain string) bool {
+		_, ok := trie.ValidAndSplitDomain(domain)
+		return ok
+	}
+	assert.True(t, validDomain("google.com"))
+	assert.False(t, validDomain(" google.com"))
+	assert.False(t, validDomain(" google.com "))
+	assert.True(t, validDomain("Mijia Cloud"))
+}