diff --git a/src/main/java/net/tccn/base/Kv.java b/src/main/java/net/tccn/base/Kv.java
index 0f9b707..6cfc555 100644
--- a/src/main/java/net/tccn/base/Kv.java
+++ b/src/main/java/net/tccn/base/Kv.java
@@ -96,7 +96,10 @@ public class Kv<K,V> extends LinkedHashMap<K,V> {
     private static Predicate<Class> isNumber = (t) -> {
         return t == Integer.class || t == int.class
                 || t == Long.class || t == long.class
+                || t == float.class || t == Float.class
                 || t == Double.class || t == double.class
+                || t == Short.class || t == short.class
+                || t == Byte.class || t == byte.class
                 ;
     };
 
@@ -119,9 +122,11 @@ public class Kv<K,V> extends LinkedHashMap<K,V> {
                     case "Short": v1 = (short)(long) v; break;
                     case "float":
                     case "Float": v1 = (float)(long) v; break;
+                    case "byte":
+                    case "Byte": v1 = (byte)(long) v; break;
                     default: v1 = v;
                 }
-            } else if (v.getClass() == Double.class && clazz != Double.class) {
+            } else if (v.getClass() == Double.class) {
                 if (isNumber.test(clazz)) {
                     switch (clazz.getSimpleName()) {
                         case "long":
@@ -132,6 +137,8 @@ public class Kv<K,V> extends LinkedHashMap<K,V> {
                         case "Short": v1 = (short)(double) v; break;
                         case "float":
                         case "Float": v1 = (float)(double) v; break;
+                        case "byte":
+                        case "Byte": v1 = (byte)(double) v; break;
                         default: v1 = v;
                     }
                 } else if (clazz == String.class){
@@ -141,7 +148,6 @@ public class Kv<K,V> extends LinkedHashMap<K,V> {
                 switch (clazz.getSimpleName()) {
                     case "Date":
                         v1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse((String) v); break;
-                    //string ==> number
                     case "short":
                     case "Short": v1 = (short)Double.parseDouble((String) v); break;
                     case "float":
@@ -152,18 +158,32 @@ public class Kv<K,V> extends LinkedHashMap<K,V> {
                     case "Long": v1 = (long)Double.parseDouble((String) v); break;
                     case "double":
                     case "Double": v1 = Double.parseDouble((String) v); break;
+                    case "byte":
+                    case "Byte": v1 = Byte.parseByte((String) v); break;
                     default: v1 = v;
                 }
             } else if (v.getClass() == Integer.class) {
                 switch (clazz.getSimpleName()) {
                     case "long":
                     case "Long": v1 = (long) (int) v; break;
-                    case "int":
-                    case "Integer": v1 = (int) v; break;
                     case "short":
                     case "Short": v1 = (short) (int) v; break;
                     case "float":
                     case "Float": v1 = (float) (int) v; break;
+                    case "byte":
+                    case "Byte": v1 = (byte)(int) v; break;
+                    default: v1 = v;
+                }
+            } else if (v.getClass() == Float.class) {
+                switch (clazz.getSimpleName()) {
+                    case "long":
+                    case "Long": v1 = (long) (float) v; break;
+                    case "int":
+                    case "Integer": v1 = (int) (float)v; break;
+                    case "short":
+                    case "Short": v1 = (short) (float) v; break;
+                    case "byte":
+                    case "Byte": v1 = (byte)(float) v; break;
                     default: v1 = v;
                 }
             }
diff --git a/src/test/java/RunTest.java b/src/test/java/RunTest.java
index 4586275..8cc09ad 100644
--- a/src/test/java/RunTest.java
+++ b/src/test/java/RunTest.java
@@ -176,7 +176,7 @@ public class RunTest<T> {
 
     //@Test
     public void kvTest() {
-        Map map = new HashMap<>();
+        /*Map map = new HashMap<>();
 
         map.put("name", "xxxx");
         map.put("age", 12);
@@ -186,7 +186,47 @@ public class RunTest<T> {
         Kv kv = Kv.toKv(user, "name", "abxx=age");
 
         System.out.println(user);
-        System.out.println(kv);
+        System.out.println(kv);*/
+        Class[] clazzs = {
+                int.class, long.class, short.class, byte.class,
+                Integer.class, Long.class, Short.class, Byte.class, float.class, Float.class,
+                String.class,
+        };
+        Object[] ks = new Object[]{"1", (int)1, (Integer)1, 1l, 1.0, 1f, 1.0d};
+
+        for (Object k : ks) {
+            System.out.println("--------------------------------------------");
+            for (Class v : clazzs) {
+                System.out.printf("%s -> %s = ", k.getClass().getSimpleName(), v.getSimpleName());
+
+                Object o = Kv.toAs(k, v);
+                switch (v.getSimpleName()) {
+                    case "int":
+                        System.out.println((int)o);break;
+                    case "Integer":
+                        System.out.println((Integer)o);break;
+                    case "long":
+                        System.out.println((long)o);break;
+                    case "Long":
+                        System.out.println((Long)o);break;
+                    case "short":
+                        System.out.println((short)o);break;
+                    case "Short":
+                        System.out.println((Short)o);break;
+                    case "byte":
+                        System.out.println((byte)o);break;
+                    case "float":
+                        System.out.println((float)o);break;
+                    case "Float":
+                        System.out.println((Float)o);break;
+                    case "Byte":
+                        System.out.println((Byte)o);break;
+                    case "String":
+                        System.out.println((String)o);break;
+                }
+            }
+        }
+
     }
 
     //@Test