diff --git a/rc-service/rc-service-order/order-inner-endpoint/src/main/java/com/red/circle/order/inner/service/impl/PayCountryClientServiceImpl.java b/rc-service/rc-service-order/order-inner-endpoint/src/main/java/com/red/circle/order/inner/service/impl/PayCountryClientServiceImpl.java
index 183e652c..d7202eb6 100644
--- a/rc-service/rc-service-order/order-inner-endpoint/src/main/java/com/red/circle/order/inner/service/impl/PayCountryClientServiceImpl.java
+++ b/rc-service/rc-service-order/order-inner-endpoint/src/main/java/com/red/circle/order/inner/service/impl/PayCountryClientServiceImpl.java
@@ -358,9 +358,13 @@ public class PayCountryClientServiceImpl implements PayCountryClientService {
     if (Objects.isNull(country) || StringUtils.isBlank(country.getAlphaTwo())) {
       return "";
     }
+    String region = country.getAlphaTwo().trim().toUpperCase(Locale.ROOT);
+    if (region.length() != 2 || !region.chars().allMatch(ch -> ch >= 'A' && ch <= 'Z')) {
+      return "";
+    }
     try {
       Locale locale = new Locale.Builder()
-          .setRegion(country.getAlphaTwo().trim().toUpperCase(Locale.ROOT))
+          .setRegion(region)
           .build();
       return Currency.getInstance(locale).getCurrencyCode();
     } catch (IllegalArgumentException | MissingResourceException e) {