diff --git a/storage/src/main/java/com/zfoo/storage/convert/ArrayConverter.java b/storage/src/main/java/com/zfoo/storage/convert/ArrayConverter.java
index a97fc58db..1433645a8 100644
--- a/storage/src/main/java/com/zfoo/storage/convert/ArrayConverter.java
+++ b/storage/src/main/java/com/zfoo/storage/convert/ArrayConverter.java
@@ -26,6 +26,10 @@
  */
 public class ArrayConverter implements ConditionalGenericConverter {
 
+    public static final ArrayConverter INSTANCE = new ArrayConverter();
+
+    private ArrayConverter() {
+    }
 
     @Override
     public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
diff --git a/storage/src/main/java/com/zfoo/storage/convert/ConvertUtils.java b/storage/src/main/java/com/zfoo/storage/convert/ConvertUtils.java
index bffb4df50..712a748d8 100644
--- a/storage/src/main/java/com/zfoo/storage/convert/ConvertUtils.java
+++ b/storage/src/main/java/com/zfoo/storage/convert/ConvertUtils.java
@@ -14,6 +14,7 @@
 
 import com.zfoo.protocol.util.StringUtils;
 import org.springframework.context.support.ConversionServiceFactoryBean;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 
 import java.lang.reflect.Array;
@@ -27,29 +28,36 @@ public abstract class ConvertUtils {
 
     private static final TypeDescriptor TYPE_DESCRIPTOR = TypeDescriptor.valueOf(String.class);
 
-    private static final ConversionServiceFactoryBean conversionServiceFactoryBean = new ConversionServiceFactoryBean();
+    private static ConversionService conversionService = customConvert(Collections.emptySet());
 
-    static {
+
+    public static ConversionService customConvert(Set<?> customConverts) {
         var converters = new HashSet<>();
-        converters.add(new ArrayConverter());
-        converters.add(new ListConverter());
-        converters.add(new SetConverter());
-        converters.add(new JsonToMapConverter());
-        converters.add(new JsonToObjectConverter());
-        converters.add(new StringToClassConverter());
-        converters.add(new StringToDateConverter());
+        // default convert
+        converters.add(ArrayConverter.INSTANCE);
+        converters.add(ListConverter.INSTANCE);
+        converters.add(SetConverter.INSTANCE);
+        converters.add(JsonToMapConverter.INSTANCE);
+        converters.add(JsonToObjectConverter.INSTANCE);
+        converters.add(StringToClassConverter.INSTANCE);
+        converters.add(StringToDateConverter.INSTANCE);
+        // custom convert
+        converters.addAll(customConverts);
+
+        ConversionServiceFactoryBean conversionServiceFactoryBean = new ConversionServiceFactoryBean();
         conversionServiceFactoryBean.setConverters(converters);
         conversionServiceFactoryBean.afterPropertiesSet();
+        return conversionServiceFactoryBean.getObject();
     }
 
 
     public static <T> T convert(String content, Class<T> targetType) {
-        return conversionServiceFactoryBean.getObject().convert(content, targetType);
+        return conversionService.convert(content, targetType);
     }
 
     public static Object convertField(String content, Field field) {
         var targetType = new TypeDescriptor(field);
-        return conversionServiceFactoryBean.getObject().convert(content, TYPE_DESCRIPTOR, targetType);
+        return conversionService.convert(content, TYPE_DESCRIPTOR, targetType);
     }
 
     public static Object convertToArray(String content, Class<?> componentType) {
@@ -75,7 +83,7 @@ public static <T> List<T> convertToList(String content, Class<T> genericType) {
         var splits = content.split(StringUtils.COMMA_REGEX);
         var list = new ArrayList<T>();
         for (var split : splits) {
-            var value = ConvertUtils.convert(StringUtils.trim(split), genericType);
+            var value = convert(StringUtils.trim(split), genericType);
             list.add(value);
         }
         return Collections.unmodifiableList(list);
diff --git a/storage/src/main/java/com/zfoo/storage/convert/JsonToMapConverter.java b/storage/src/main/java/com/zfoo/storage/convert/JsonToMapConverter.java
index 2969b3e76..927689e06 100644
--- a/storage/src/main/java/com/zfoo/storage/convert/JsonToMapConverter.java
+++ b/storage/src/main/java/com/zfoo/storage/convert/JsonToMapConverter.java
@@ -26,6 +26,12 @@
  * @author godotg
  */
 public class JsonToMapConverter implements ConditionalGenericConverter {
+
+    public static final JsonToMapConverter INSTANCE = new JsonToMapConverter();
+
+    private JsonToMapConverter() {
+    }
+
     @Override
     public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
         return sourceType.getType() == String.class && targetType.isMap();
diff --git a/storage/src/main/java/com/zfoo/storage/convert/JsonToObjectConverter.java b/storage/src/main/java/com/zfoo/storage/convert/JsonToObjectConverter.java
index 673f7a5ab..cbf989cc2 100644
--- a/storage/src/main/java/com/zfoo/storage/convert/JsonToObjectConverter.java
+++ b/storage/src/main/java/com/zfoo/storage/convert/JsonToObjectConverter.java
@@ -29,6 +29,10 @@
  */
 public class JsonToObjectConverter implements ConditionalGenericConverter {
 
+    public static final JsonToObjectConverter INSTANCE = new JsonToObjectConverter();
+
+    private JsonToObjectConverter() {
+    }
 
     @Override
     public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
diff --git a/storage/src/main/java/com/zfoo/storage/convert/ListConverter.java b/storage/src/main/java/com/zfoo/storage/convert/ListConverter.java
index c04037da8..edcffdc79 100644
--- a/storage/src/main/java/com/zfoo/storage/convert/ListConverter.java
+++ b/storage/src/main/java/com/zfoo/storage/convert/ListConverter.java
@@ -30,6 +30,10 @@
  */
 public class ListConverter implements ConditionalGenericConverter {
 
+    public static final ListConverter INSTANCE = new ListConverter();
+
+    private ListConverter() {
+    }
 
     @Override
     public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
diff --git a/storage/src/main/java/com/zfoo/storage/convert/SetConverter.java b/storage/src/main/java/com/zfoo/storage/convert/SetConverter.java
index 36660a896..823ad09e0 100644
--- a/storage/src/main/java/com/zfoo/storage/convert/SetConverter.java
+++ b/storage/src/main/java/com/zfoo/storage/convert/SetConverter.java
@@ -29,6 +29,10 @@
  */
 public class SetConverter implements ConditionalGenericConverter {
 
+    public static final SetConverter INSTANCE = new SetConverter();
+
+    private SetConverter() {
+    }
 
     @Override
     public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
diff --git a/storage/src/main/java/com/zfoo/storage/convert/StringToClassConverter.java b/storage/src/main/java/com/zfoo/storage/convert/StringToClassConverter.java
index 71295852e..acf405bed 100644
--- a/storage/src/main/java/com/zfoo/storage/convert/StringToClassConverter.java
+++ b/storage/src/main/java/com/zfoo/storage/convert/StringToClassConverter.java
@@ -22,6 +22,10 @@
  */
 public class StringToClassConverter implements Converter<String, Class<?>> {
 
+    public static final StringToClassConverter INSTANCE = new StringToClassConverter();
+
+    private StringToClassConverter() {
+    }
 
     @Override
     public Class<?> convert(String source) {
diff --git a/storage/src/main/java/com/zfoo/storage/convert/StringToDateConverter.java b/storage/src/main/java/com/zfoo/storage/convert/StringToDateConverter.java
index fa921fac3..d6a96997b 100644
--- a/storage/src/main/java/com/zfoo/storage/convert/StringToDateConverter.java
+++ b/storage/src/main/java/com/zfoo/storage/convert/StringToDateConverter.java
@@ -25,6 +25,10 @@
  */
 public class StringToDateConverter implements Converter<String, Date> {
 
+    public static final StringToDateConverter INSTANCE = new StringToDateConverter();
+
+    private StringToDateConverter() {
+    }
 
     @Override
     public Date convert(String source) {
diff --git a/storage/src/test/java/com/zfoo/storage/convert/ConversionTest.java b/storage/src/test/java/com/zfoo/storage/convert/ConversionTest.java
index 753d347d8..68aab6747 100644
--- a/storage/src/test/java/com/zfoo/storage/convert/ConversionTest.java
+++ b/storage/src/test/java/com/zfoo/storage/convert/ConversionTest.java
@@ -31,10 +31,10 @@ public class ConversionTest {
     private static final ConversionServiceFactoryBean csfb = new ConversionServiceFactoryBean();
     private static final Set<Object> converters = new HashSet<>();
 
-    private static final StringToDateConverter std = new StringToDateConverter();
-    private static final StringToClassConverter stcc = new StringToClassConverter();
-    private static final JsonToMapConverter jtmc = new JsonToMapConverter();
-    private static final ArrayConverter jtac = new ArrayConverter();
+    private static final StringToDateConverter std = StringToDateConverter.INSTANCE;
+    private static final StringToClassConverter stcc = StringToClassConverter.INSTANCE;
+    private static final JsonToMapConverter jtmc = JsonToMapConverter.INSTANCE;
+    private static final ArrayConverter jtac = ArrayConverter.INSTANCE;
 
     static {
         converters.add(std);