diff --git a/actix-threadpool/CHANGES.md b/actix-threadpool/CHANGES.md
index 9b481fbf..26dc42a9 100644
--- a/actix-threadpool/CHANGES.md
+++ b/actix-threadpool/CHANGES.md
@@ -1,5 +1,7 @@
 # Changes
 
+* Rework pool's gut.
+
 ## [0.3.3] - 2020-07-14
 
 ### Changed
diff --git a/actix-threadpool/Cargo.toml b/actix-threadpool/Cargo.toml
index 5998bae7..2250c391 100644
--- a/actix-threadpool/Cargo.toml
+++ b/actix-threadpool/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "actix-threadpool"
-version = "0.3.3"
+version = "0.4.0"
 authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
 description = "Actix thread pool for sync code"
 keywords = ["actix", "network", "framework", "async", "futures"]
@@ -20,8 +20,10 @@ path = "src/lib.rs"
 [dependencies]
 derive_more = "0.99.2"
 futures-channel = "0.3.1"
-parking_lot = "0.11"
+jian_rs = { git = "https://github.com/fakeshadow/jian_rs"}
 lazy_static = "1.3"
 log = "0.4"
 num_cpus = "1.10"
-threadpool = "1.7"
+
+[dev-dependencies]
+actix-rt = "1"
diff --git a/actix-threadpool/src/lib.rs b/actix-threadpool/src/lib.rs
index 08b563ef..56e5c528 100644
--- a/actix-threadpool/src/lib.rs
+++ b/actix-threadpool/src/lib.rs
@@ -1,41 +1,80 @@
 //! Thread pool for blocking operations
+//!
+//! The pool would lazily generate thread according to the workload and spawn up to a total amount
+//! of you machine's `logical CPU cores * 5` threads. Any spawned threads kept idle for 3 minutes
+//! would be recycled and de spawned.
+//!
+//! # Example:
+//! ```rust
+//! #[actix_rt::main]
+//! async fn main() {
+//!     // Optional: Set the max thread count for the blocking pool.
+//!     std::env::set_var("ACTIX_THREADPOOL", "30");
+//!     // Optional: Set the timeout duration IN SECONDS for the blocking pool's idle threads.
+//!     std::env::set_var("ACTIX_THREADPOOL_TIMEOUT", "300");
+//!
+//!     let future = actix_threadpool::run(|| {
+//!         /* Some blocking code with a Result<T, E> as return type */
+//!         Ok::<usize, ()>(1usize)
+//!     });
+//!
+//!     // calling actix::web::block(|| {}) would have the same functionality.
+//!
+//!     /*
+//!         We can await on this blocking code and NOT block our runtime.
+//!         When we waiting our actix runtime can switch to other async tasks.
+//!     */
+//!
+//!     let result: Result<usize, actix_threadpool::BlockingError<()>> = future.await;
+//!
+//!     assert_eq!(1usize, result.unwrap())
+//! }
+//! ```
 
 use std::fmt;
 use std::future::Future;
 use std::pin::Pin;
 use std::task::{Context, Poll};
+use std::time::Duration;
 
 use derive_more::Display;
 use futures_channel::oneshot;
-use parking_lot::Mutex;
-use threadpool::ThreadPool;
+use jian_rs::ThreadPool;
 
 /// Env variable for default cpu pool size.
-const ENV_CPU_POOL_VAR: &str = "ACTIX_THREADPOOL";
+const ENV_MAX_THREADS: &str = "ACTIX_THREADPOOL";
+
+/// Env variable for default thread idle timeout duration.
+const ENV_IDLE_TIMEOUT: &str = "ACTIX_THREADPOOL_TIMEOUT";
 
 lazy_static::lazy_static! {
-    pub(crate) static ref DEFAULT_POOL: Mutex<ThreadPool> = {
-        let num = std::env::var(ENV_CPU_POOL_VAR)
+    pub(crate) static ref POOL: ThreadPool = {
+        let num = std::env::var(ENV_MAX_THREADS)
             .map_err(|_| ())
             .and_then(|val| {
                 val.parse().map_err(|_| log::warn!(
                     "Can not parse {} value, using default",
-                    ENV_CPU_POOL_VAR,
+                    ENV_MAX_THREADS,
                 ))
             })
             .unwrap_or_else(|_| num_cpus::get() * 5);
-        Mutex::new(
-            threadpool::Builder::new()
-                .thread_name("actix-web".to_owned())
-                .num_threads(num)
-                .build(),
-        )
-    };
-}
 
-thread_local! {
-    static POOL: ThreadPool = {
-        DEFAULT_POOL.lock().clone()
+        let dur = std::env::var(ENV_IDLE_TIMEOUT)
+            .map_err(|_| ())
+            .and_then(|val| {
+                val.parse().map_err(|_| log::warn!(
+                    "Can not parse {} value, using default",
+                    ENV_IDLE_TIMEOUT,
+                ))
+            })
+            .unwrap_or_else(|_| 60 * 5);
+
+        ThreadPool::builder()
+            .thread_name("actix-threadpool")
+            .max_threads(num)
+            .min_threads(1)
+            .idle_timeout(Duration::from_secs(dur))
+            .build()
     };
 }
 
@@ -59,12 +98,11 @@ where
     E: Send + fmt::Debug + 'static,
 {
     let (tx, rx) = oneshot::channel();
-    POOL.with(|pool| {
-        pool.execute(move || {
-            if !tx.is_canceled() {
-                let _ = tx.send(f());
-            }
-        })
+
+    let _ = POOL.execute(move || {
+        if !tx.is_canceled() {
+            let _ = tx.send(f());
+        }
     });
 
     CpuFuture { rx }
diff --git a/actix-threadpool/tests/test_thread_pool.rs b/actix-threadpool/tests/test_thread_pool.rs
new file mode 100644
index 00000000..b482d189
--- /dev/null
+++ b/actix-threadpool/tests/test_thread_pool.rs
@@ -0,0 +1,21 @@
+#[actix_rt::test]
+async fn async_work() {
+    use core::sync::atomic::{AtomicUsize, Ordering};
+    use core::time::Duration;
+
+    use std::sync::Arc;
+
+    let counter = Arc::new(AtomicUsize::new(0));
+
+    for _ in 0..1024 {
+        let counter = counter.clone();
+        let _ = actix_threadpool::run(move || {
+            counter.fetch_add(1, Ordering::Release);
+            std::thread::sleep(Duration::from_millis(1));
+            Ok::<(), ()>(())
+        })
+        .await;
+    }
+
+    assert_eq!(1024, counter.load(Ordering::Acquire));
+}