diff --git a/Cargo.toml b/Cargo.toml
index 4b3a4e9..8cbdc24 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,7 +44,7 @@ blake3 = "1.3"
 hex = "0.4"
 image = "0.24"
 once_cell = "1.9"
-rand = "0.8"
+rand_chacha = "0.3"
 sha2 = "0.10"
 sysinfo = "0.23"
 serde = { version = "1", features = ["derive"] }
diff --git a/src/account.rs b/src/account.rs
index 1759160..ec300d2 100644
--- a/src/account.rs
+++ b/src/account.rs
@@ -1,4 +1,7 @@
-use rand::Rng;
+use rand_chacha::{
+    rand_core::{RngCore, SeedableRng},
+    ChaChaRng,
+};
 use serde::{Deserialize, Serialize};
 use std::time::{SystemTime, UNIX_EPOCH};
 use tdn::types::{
@@ -145,7 +148,9 @@ impl Account {
         let wallet = ChainToken::ETH.update_main(&wallet_address, "");
         let w = Address::new(ChainToken::ETH, 0, wallet_address, true);
 
-        let key = rand::thread_rng().gen::<[u8; 32]>();
+        let mut rng = ChaChaRng::from_entropy();
+        let mut key = [0u8; 32];
+        rng.fill_bytes(&mut key);
         let ckey = encrypt_key(salt, lock, &key)?;
         let mut ebytes = encrypt_multiple(
             salt,
diff --git a/src/apps/dao/models/group.rs b/src/apps/dao/models/group.rs
index cac3e66..8e74f9f 100644
--- a/src/apps/dao/models/group.rs
+++ b/src/apps/dao/models/group.rs
@@ -1,4 +1,7 @@
-use rand::Rng;
+use rand_chacha::{
+    rand_core::{RngCore, SeedableRng},
+    ChaChaRng,
+};
 use std::path::PathBuf;
 use std::time::{SystemTime, UNIX_EPOCH};
 use tdn::types::{
@@ -58,7 +61,10 @@ impl GroupChat {
         is_ok: bool,
         is_remote: bool,
     ) -> Self {
-        let g_id = GroupId(rand::thread_rng().gen::<[u8; 32]>());
+        let mut rng = ChaChaRng::from_entropy();
+        let mut bytes = [0u8; 32];
+        rng.fill_bytes(&mut bytes);
+        let g_id = GroupId(bytes);
 
         let start = SystemTime::now();
         let datetime = start
diff --git a/src/apps/file/models.rs b/src/apps/file/models.rs
index f2f6fb0..5cdbc85 100644
--- a/src/apps/file/models.rs
+++ b/src/apps/file/models.rs
@@ -1,4 +1,7 @@
-use rand::Rng;
+use rand_chacha::{
+    rand_core::{RngCore, SeedableRng},
+    ChaChaRng,
+};
 use serde::{Deserialize, Serialize};
 use std::time::{SystemTime, UNIX_EPOCH};
 use tdn::types::{
@@ -50,7 +53,10 @@ pub(crate) struct FileDid([u8; 32]);
 
 impl FileDid {
     pub fn generate() -> Self {
-        Self(rand::thread_rng().gen::<[u8; 32]>())
+        let mut rng = ChaChaRng::from_entropy();
+        let mut key = [0u8; 32];
+        rng.fill_bytes(&mut key);
+        Self(key)
     }
 
     pub fn to_hex(&self) -> String {
diff --git a/src/apps/group/models/group.rs b/src/apps/group/models/group.rs
index c993dbd..7433213 100644
--- a/src/apps/group/models/group.rs
+++ b/src/apps/group/models/group.rs
@@ -1,5 +1,8 @@
 use group_types::GroupChatId;
-use rand::Rng;
+use rand_chacha::{
+    rand_core::{RngCore, SeedableRng},
+    ChaChaRng,
+};
 use std::time::{SystemTime, UNIX_EPOCH};
 use tdn::types::{
     primitives::{PeerId, Result},
@@ -31,7 +34,8 @@ pub(crate) struct GroupChat {
 
 impl GroupChat {
     pub fn new(addr: PeerId, name: String) -> Self {
-        let gid = rand::thread_rng().gen::<GroupChatId>();
+        let mut rng = ChaChaRng::from_entropy();
+        let gid = rng.next_u64();
 
         Self {
             gid,
diff --git a/src/apps/jarvis/rpc.rs b/src/apps/jarvis/rpc.rs
index f386ea4..c3c38fe 100644
--- a/src/apps/jarvis/rpc.rs
+++ b/src/apps/jarvis/rpc.rs
@@ -1,5 +1,8 @@
 use esse_primitives::MessageType;
-use rand::Rng;
+use rand_chacha::{
+    rand_core::{RngCore, SeedableRng},
+    ChaChaRng,
+};
 use std::sync::Arc;
 use tdn::types::{
     message::RpcSendMessage,
@@ -28,7 +31,9 @@ async fn reply(
     let content = if msg.m_type == MessageType::String {
         if msg.content.ends_with("?") || msg.content.ends_with("？") {
             // answer book. ascill ? and SBC case.
-            let answer = rand::thread_rng().gen_range(0..171);
+            let mut rng = ChaChaRng::from_entropy();
+            let n = rng.next_u32();
+            let answer = (n % 171) as usize;
             load_answer(&lang, answer)
         } else {
             msg.content
diff --git a/src/storage.rs b/src/storage.rs
index 907ad79..c688d28 100644
--- a/src/storage.rs
+++ b/src/storage.rs
@@ -1,6 +1,9 @@
 use esse_primitives::id_to_str;
 use image::{load_from_memory, DynamicImage, GenericImageView};
-use rand::{distributions::Alphanumeric, thread_rng, Rng};
+use rand_chacha::{
+    rand_core::{RngCore, SeedableRng},
+    ChaChaRng,
+};
 use std::path::PathBuf;
 use std::time::{SystemTime, UNIX_EPOCH};
 use tdn::types::primitives::{PeerId, Result};
@@ -127,11 +130,10 @@ pub(crate) async fn read_image(base: &PathBuf, pid: &PeerId, name: &str) -> Resu
 
 #[inline]
 fn image_name() -> String {
-    let mut name: String = thread_rng()
-        .sample_iter(&Alphanumeric)
-        .take(20)
-        .map(char::from)
-        .collect();
+    let mut rng = ChaChaRng::from_entropy();
+    let mut key = [0u8; 20];
+    rng.fill_bytes(&mut key);
+    let mut name = hex::encode(&key);
     name.push_str(".png");
     name
 }