diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/sms/SimUtil.java b/mpmaster/src/main/java/com/xypower/mpmaster/sms/SimUtil.java
index 2fd4c6b2..0318d5bc 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/sms/SimUtil.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/sms/SimUtil.java
@@ -575,7 +575,7 @@ public class SimUtil {
                         String[] strings = StringUtils.splitString2(substring);
                         if (strings != null && strings.length > 0) {
                             for (int i = 0; i < strings.length; i++) {
-                                if ("su".equals(strings[0])) {
+                                if (i == 0 && "su".equals(strings[0])) {
                                     ifsu = true;
                                 } else {
                                     ifsu = false;