diff --git a/Cargo.toml b/Cargo.toml
index ffc5f0d..e18f3e0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,8 +13,9 @@ categories = ["algorithms"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-
+rand = { version = "0.9.0" , optional = true}
 [features]
-default = ["std"]
+default = ["std","random"]
 std = []
 no_std = []
+random = ["std","rand"]
\ No newline at end of file
diff --git a/README.org b/README.org
index 8b4ad13..9045bda 100644
--- a/README.org
+++ b/README.org
@@ -33,3 +33,5 @@
 
 *** utils 工具
 - [[./src/utils.rs::41][rotate 旋转数组]]
+- [[./src/utils.rs][rand_vec 随机向量生成]]   
+   
diff --git a/src/utils.rs b/src/utils.rs
index 06fc38b..842b410 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,3 +1,6 @@
+#[cfg(feature = "random")]
+use rand::{self, Rng};
+
 /// test the time of function
 /// # Examples
 /// ```