diff --git a/internal/parser/planparserv2/parser_visitor.go b/internal/parser/planparserv2/parser_visitor.go
index fda5c981e7..5adccad6e8 100644
--- a/internal/parser/planparserv2/parser_visitor.go
+++ b/internal/parser/planparserv2/parser_visitor.go
@@ -131,7 +131,7 @@ func (v *ParserVisitor) VisitFloating(ctx *parser.FloatingContext) interface{} {
 
 // VisitString translates expr to GenericValue.
 func (v *ParserVisitor) VisitString(ctx *parser.StringContext) interface{} {
-	pattern, err := convertEscapeSingle(ctx.StringLiteral().GetText())
+	pattern, err := convertEscapeSingle(ctx.GetText())
 	if err != nil {
 		return err
 	}
diff --git a/internal/parser/planparserv2/plan_parser_v2.go b/internal/parser/planparserv2/plan_parser_v2.go
index 6916a70220..af3a1c9cac 100644
--- a/internal/parser/planparserv2/plan_parser_v2.go
+++ b/internal/parser/planparserv2/plan_parser_v2.go
@@ -2,7 +2,9 @@ package planparserv2
 
 import (
 	"fmt"
+	"strings"
 	"time"
+	"unicode"
 
 	"github.com/antlr/antlr4/runtime/Go/antlr"
 	"github.com/hashicorp/golang-lru/v2/expirable"
@@ -126,7 +128,39 @@ func CreateRetrievePlan(schema *typeutil.SchemaHelper, exprStr string) (*planpb.
 	return planNode, nil
 }
 
+func convertHanToASCII(s string) string {
+	var builder strings.Builder
+	builder.Grow(len(s) * 6)
+	skipCur := false
+	n := len(s)
+	for i, r := range s {
+		if skipCur {
+			builder.WriteRune(r)
+			skipCur = false
+			continue
+		}
+		if r == '\\' {
+			if i+1 < n && !isEscapeCh(s[i+1]) {
+				return s
+			}
+			skipCur = true
+			builder.WriteRune(r)
+			continue
+		}
+
+		if unicode.Is(unicode.Han, r) {
+			builder.WriteString(formatUnicode(uint32(r)))
+		} else {
+			builder.WriteRune(r)
+		}
+	}
+
+	return builder.String()
+}
+
 func CreateSearchPlan(schema *typeutil.SchemaHelper, exprStr string, vectorFieldName string, queryInfo *planpb.QueryInfo) (*planpb.PlanNode, error) {
+	exprStr = convertHanToASCII(exprStr)
+
 	parse := func() (*planpb.Expr, error) {
 		if len(exprStr) <= 0 {
 			return nil, nil
diff --git a/internal/parser/planparserv2/plan_parser_v2_test.go b/internal/parser/planparserv2/plan_parser_v2_test.go
index c9c059d78b..4642161d88 100644
--- a/internal/parser/planparserv2/plan_parser_v2_test.go
+++ b/internal/parser/planparserv2/plan_parser_v2_test.go
@@ -2,6 +2,7 @@ package planparserv2
 
 import (
 	"fmt"
+	"math/rand"
 	"sync"
 	"testing"
 
@@ -1053,13 +1054,14 @@ c'`,
 		`A == "\中国"`,
 	}
 	for _, expr = range invalidExprs {
-		_, err = CreateSearchPlan(schema, expr, "FloatVectorField", &planpb.QueryInfo{
+		plan, err := CreateSearchPlan(schema, expr, "FloatVectorField", &planpb.QueryInfo{
 			Topk:         0,
 			MetricType:   "",
 			SearchParams: "",
 			RoundDecimal: 0,
 		})
 		assert.Error(t, err)
+		fmt.Println(plan)
 	}
 }
 
@@ -1338,3 +1340,54 @@ func BenchmarkNoPlanCache(b *testing.B) {
 		assert.NoError(b, err)
 	}
 }
+
+func randomChineseString(length int) string {
+	min := 0x4e00
+	max := 0x9fa5
+
+	result := make([]rune, length)
+	for i := 0; i < length; i++ {
+		result[i] = rune(rand.Intn(max-min+1) + min)
+	}
+
+	return string(result)
+}
+
+func BenchmarkWithString(b *testing.B) {
+	schema := newTestSchema()
+	schemaHelper, err := typeutil.CreateSchemaHelper(schema)
+	require.NoError(b, err)
+
+	expr := ""
+	for i := 0; i < 100; i++ {
+		expr += fmt.Sprintf(`"%s",`, randomChineseString(rand.Intn(100)))
+	}
+	expr = "StringField in [" + expr + "]"
+
+	for i := 0; i < b.N; i++ {
+		plan, err := CreateSearchPlan(schemaHelper, expr, "FloatVectorField", &planpb.QueryInfo{
+			Topk:         0,
+			MetricType:   "",
+			SearchParams: "",
+			RoundDecimal: 0,
+		})
+		assert.NoError(b, err)
+		assert.NotNil(b, plan)
+	}
+}
+
+func Test_convertHanToASCII(t *testing.T) {
+	type testcase struct {
+		source string
+		target string
+	}
+	testcases := []testcase{
+		{`A in ["中国"]`, `A in ["\u4e2d\u56fd"]`},
+		{`A in ["\中国"]`, `A in ["\中国"]`},
+		{`A in ["\\中国"]`, `A in ["\\\u4e2d\u56fd"]`},
+	}
+
+	for _, c := range testcases {
+		assert.Equal(t, c.target, convertHanToASCII(c.source))
+	}
+}
diff --git a/internal/parser/planparserv2/utils.go b/internal/parser/planparserv2/utils.go
index 24c042d615..db87dcfa2b 100644
--- a/internal/parser/planparserv2/utils.go
+++ b/internal/parser/planparserv2/utils.go
@@ -539,3 +539,25 @@ func isIntegerColumn(col *planpb.ColumnInfo) bool {
 		(typeutil.IsArrayType(col.GetDataType()) && typeutil.IsIntegerType(col.GetElementType())) ||
 		typeutil.IsJSONType(col.GetDataType())
 }
+
+func isEscapeCh(ch uint8) bool {
+	return ch == '\\' || ch == 'n' || ch == 't' || ch == 'r' || ch == 'f' || ch == '"' || ch == '\''
+}
+
+func formatUnicode(r uint32) string {
+	return string([]byte{
+		'\\', 'u',
+		hexDigit(r >> 12),
+		hexDigit(r >> 8),
+		hexDigit(r >> 4),
+		hexDigit(r),
+	})
+}
+
+func hexDigit(n uint32) byte {
+	n &= 0xf
+	if n < 10 {
+		return byte(n) + '0'
+	}
+	return byte(n-10) + 'a'
+}