diff --git a/Cargo.toml b/Cargo.toml
index 0b4575fa..e2f67e32 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "tardis"
-version = "0.1.0-alpha14"
+version = "0.1.0-alpha15"
 authors = ["gudaoxuri <i@sunisle.org>"]
 description = "Elegant, clean Rust development framework"
 keywords = ["http", "database", "web", "redis", "mq"]
diff --git a/src/basic/field.rs b/src/basic/field.rs
index 94681900..c16d7730 100644
--- a/src/basic/field.rs
+++ b/src/basic/field.rs
@@ -11,8 +11,8 @@ lazy_static! {
     static ref R_CODE_CS: Regex = Regex::new(r"^[A-Za-z0-9_]+$").expect("Regular parsing error");
 }
 
-static BASE62: &str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
-static BASE36: &str = "abcdefghijklmnopqrstuvwxyz0123456789";
+static BASE62: &str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+static BASE36: &str = "0123456789abcdefghijklmnopqrstuvwxyz";
 
 pub static GENERAL_SPLIT: &str = "##";
 
@@ -26,9 +26,9 @@ pub static GENERAL_SPLIT: &str = "##";
 /// use tardis::TardisFuns;
 /// assert!(TardisFuns::field.is_phone("18657120202"));
 /// assert_eq!(TardisFuns::field.incr_by_base62("abcd1").unwrap(), "abcd2");
-/// assert!(TardisFuns::field.incr_by_base62("999").is_none());
+/// assert!(TardisFuns::field.incr_by_base62("zzz").is_none());
 /// assert_eq!(TardisFuns::field.incr_by_base36("abcd1").unwrap(), "abcd2");
-/// assert!(TardisFuns::field.incr_by_base36("999").is_none());
+/// assert!(TardisFuns::field.incr_by_base36("zzz").is_none());
 /// assert!(TardisFuns::field.is_code_cs("Adw834_dfds"));
 /// assert!(!TardisFuns::field.is_code_cs(" Adw834_dfds"));
 /// assert!(!TardisFuns::field.is_code_cs("Adw834_d-fds"));
@@ -90,10 +90,11 @@ impl TardisField {
     /// use tardis::TardisFuns;
     /// assert_eq!(TardisFuns::field.incr_by_base62("abcd1").unwrap(), "abcd2");
     /// assert_eq!(TardisFuns::field.incr_by_base62("abcd12").unwrap(), "abcd13");
-    /// assert_eq!(TardisFuns::field.incr_by_base62("abcd9").unwrap(), "abceA");
-    /// assert_eq!(TardisFuns::field.incr_by_base62("azzz9").unwrap(), "azz0A");
-    /// assert_eq!(TardisFuns::field.incr_by_base62("a9999").unwrap(), "bAAAA");
-    /// assert!(TardisFuns::field.incr_by_base62("999").is_none());
+    /// assert_eq!(TardisFuns::field.incr_by_base62("abcd9").unwrap(), "abcdA");
+    /// assert_eq!(TardisFuns::field.incr_by_base62("abcdz").unwrap(), "abce0");
+    /// assert_eq!(TardisFuns::field.incr_by_base62("azZzz").unwrap(), "aza00");
+    /// assert_eq!(TardisFuns::field.incr_by_base62("azzzz").unwrap(), "b0000");
+    /// assert!(TardisFuns::field.incr_by_base62("zzz").is_none());
     /// ```
     ///
     pub fn incr_by_base62(&self, str: &str) -> Option<String> {
@@ -117,10 +118,12 @@ impl TardisField {
     /// use tardis::TardisFuns;
     /// assert_eq!(TardisFuns::field.incr_by_base36("abcd1").unwrap(), "abcd2");
     /// assert_eq!(TardisFuns::field.incr_by_base36("abcd12").unwrap(), "abcd13");
-    /// assert_eq!(TardisFuns::field.incr_by_base36("abcd9").unwrap(), "abcea");
-    /// assert_eq!(TardisFuns::field.incr_by_base36("azzz9").unwrap(), "azz0a");
-    /// assert_eq!(TardisFuns::field.incr_by_base36("a9999").unwrap(), "baaaa");
-    /// assert!(TardisFuns::field.incr_by_base36("999").is_none());
+    /// assert_eq!(TardisFuns::field.incr_by_base36("abcd9").unwrap(), "abcda");
+    /// assert_eq!(TardisFuns::field.incr_by_base36("0000").unwrap(), "0001");
+    /// assert_eq!(TardisFuns::field.incr_by_base36("000z").unwrap(), "0010");
+    /// assert_eq!(TardisFuns::field.incr_by_base36("azzzy").unwrap(), "azzzz");
+    /// assert_eq!(TardisFuns::field.incr_by_base36("azzzz").unwrap(), "b0000");
+    /// assert!(TardisFuns::field.incr_by_base36("zzz").is_none());
     /// ```
     ///
     pub fn incr_by_base36(&self, str: &str) -> Option<String> {
diff --git a/tests/test_basic_field.rs b/tests/test_basic_field.rs
index e24d391d..dc4fc023 100644
--- a/tests/test_basic_field.rs
+++ b/tests/test_basic_field.rs
@@ -5,19 +5,22 @@ use tardis::TardisFuns;
 async fn test_basic_field() -> TardisResult<()> {
     assert!(TardisFuns::field.is_phone("18657120202"));
 
-    assert_eq!(TardisFuns::field.incr_by_base62("abcd1").unwrap(), "abcd2");
-    assert_eq!(TardisFuns::field.incr_by_base62("abcd12").unwrap(), "abcd13");
-    assert_eq!(TardisFuns::field.incr_by_base62("abcd9").unwrap(), "abceA");
-    assert_eq!(TardisFuns::field.incr_by_base62("azzz9").unwrap(), "azz0A");
-    assert_eq!(TardisFuns::field.incr_by_base62("a9999").unwrap(), "bAAAA");
-    assert!(TardisFuns::field.incr_by_base62("999").is_none());
-
     assert_eq!(TardisFuns::field.incr_by_base36("abcd1").unwrap(), "abcd2");
     assert_eq!(TardisFuns::field.incr_by_base36("abcd12").unwrap(), "abcd13");
-    assert_eq!(TardisFuns::field.incr_by_base36("abcd9").unwrap(), "abcea");
-    assert_eq!(TardisFuns::field.incr_by_base36("azzz9").unwrap(), "azz0a");
-    assert_eq!(TardisFuns::field.incr_by_base36("a9999").unwrap(), "baaaa");
-    assert!(TardisFuns::field.incr_by_base36("999").is_none());
+    assert_eq!(TardisFuns::field.incr_by_base36("abcd9").unwrap(), "abcda");
+    assert_eq!(TardisFuns::field.incr_by_base36("0000").unwrap(), "0001");
+    assert_eq!(TardisFuns::field.incr_by_base36("000z").unwrap(), "0010");
+    assert_eq!(TardisFuns::field.incr_by_base36("azzzy").unwrap(), "azzzz");
+    assert_eq!(TardisFuns::field.incr_by_base36("azzzz").unwrap(), "b0000");
+    assert!(TardisFuns::field.incr_by_base36("zzz").is_none());
+
+    assert_eq!(TardisFuns::field.incr_by_base62("abcd1").unwrap(), "abcd2");
+    assert_eq!(TardisFuns::field.incr_by_base62("abcd12").unwrap(), "abcd13");
+    assert_eq!(TardisFuns::field.incr_by_base62("abcd9").unwrap(), "abcdA");
+    assert_eq!(TardisFuns::field.incr_by_base62("abcdz").unwrap(), "abce0");
+    assert_eq!(TardisFuns::field.incr_by_base62("azZzz").unwrap(), "aza00");
+    assert_eq!(TardisFuns::field.incr_by_base62("azzzz").unwrap(), "b0000");
+    assert!(TardisFuns::field.incr_by_base62("zzz").is_none());
 
     assert!(TardisFuns::field.is_code_cs("Adw834_dfds"));
     assert!(!TardisFuns::field.is_code_cs(" Adw834_dfds"));