diff --git a/pkg/factory/factory.go b/pkg/factory/factory.go
index 35e57da0..3629452a 100644
--- a/pkg/factory/factory.go
+++ b/pkg/factory/factory.go
@@ -7,6 +7,7 @@ package factory
 import (
 	"fmt"
 	"io/ioutil"
+	"strings"
 
 	"github.com/asaskevich/govalidator"
 	"gopkg.in/yaml.v2"
@@ -19,6 +20,23 @@ var (
 	UERoutingConfig *RoutingConfig
 )
 
+func changeSdToLowercase(cfg *Config) {
+	// snssaiInfos
+	SNssaiInfo := cfg.Configuration.SNssaiInfo
+	for i := range SNssaiInfo {
+		SNssaiInfo[i].SNssai.Sd = strings.ToLower(SNssaiInfo[i].SNssai.Sd)
+	}
+
+	// userplaneInformation
+	UPNodes := cfg.Configuration.UserPlaneInformation.UPNodes
+	for i := range UPNodes {
+		SNssaiInfos := UPNodes[i].SNssaiInfos
+		for j := range SNssaiInfos {
+			SNssaiInfos[j].SNssai.Sd = strings.ToLower(SNssaiInfos[j].SNssai.Sd)
+		}
+	}
+}
+
 // TODO: Support configuration update from REST api
 func InitConfigFactory(f string, cfg *Config) error {
 	if f == "" {
@@ -34,6 +52,7 @@ func InitConfigFactory(f string, cfg *Config) error {
 			return fmt.Errorf("[Factory] %+v", yamlErr)
 		}
 	}
+	changeSdToLowercase(cfg)
 
 	return nil
 }