diff --git a/src/bin/using-crate-delay_timer-in-async-context.rs b/src/bin/using-crate-delay_timer-in-async-context.rs
new file mode 100644
index 0000000..a4b0b99
--- /dev/null
+++ b/src/bin/using-crate-delay_timer-in-async-context.rs
@@ -0,0 +1,48 @@
+use delay_timer::prelude::*;
+
+use anyhow::Result;
+
+use smol::Timer;
+use std::time::Duration;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    // In addition to the mixed (smol & tokio) runtime
+    // You can also share a tokio runtime with delayTimer, please see api `DelayTimerBuilder::tokio_runtime` for details.
+
+    // Build an DelayTimer that uses the default configuration of the Smol runtime internally.
+    let delay_timer = DelayTimerBuilder::default().build();
+
+    // Develop a print job that runs in an asynchronous cycle.
+    let task_instance_chain = delay_timer.insert_task(build_task_async_print()?)?;
+
+    // Get the running instance of task 1.
+    let task_instance = task_instance_chain.next_with_async_wait().await?;
+
+    // Cancel running task instances.
+    task_instance.cancel_with_async_wait().await?;
+
+    // Remove task which id is 1.
+    delay_timer.remove_task(1)?;
+
+    // No new tasks are accepted; running tasks are not affected.
+    Ok(delay_timer.stop_delay_timer()?)
+}
+
+fn build_task_async_print() -> Result<Task, TaskError> {
+    let mut task_builder = TaskBuilder::default();
+
+    let body = || async {
+        println!("create_async_fn_body!");
+
+        Timer::after(Duration::from_secs(3)).await;
+
+        println!("create_async_fn_body:i'success");
+    };
+
+    task_builder
+        .set_task_id(1)
+        .set_frequency_repeated_by_seconds(6)
+        .set_maximum_parallel_runnable_num(2)
+        .spawn_async_routine(body)
+}
diff --git a/src/bin/using-crate-delay_timer-internal.rs b/src/bin/using-crate-delay_timer-internal.rs
new file mode 100644
index 0000000..416463e
--- /dev/null
+++ b/src/bin/using-crate-delay_timer-internal.rs
@@ -0,0 +1,45 @@
+use anyhow::Result;
+use delay_timer::prelude::*;
+use smol::Timer;
+use std::time::Duration;
+
+fn main() -> Result<()> {
+    // Build an DelayTimer that uses the default configuration of the `smol` runtime internally.
+    let delay_timer = DelayTimerBuilder::default().build();
+
+    // Develop a print job that runs in an asynchronous cycle.
+    // A chain of task instances.
+    let task_instance_chain = delay_timer.insert_task(build_task_async_print()?)?;
+
+    // Get the running instance of task 1.
+    let task_instance = task_instance_chain.next_with_wait()?;
+
+    // Cancel running task instances.
+    task_instance.cancel_with_wait()?;
+
+    // Remove task which id is 1.
+    delay_timer.remove_task(1)?;
+
+    // No new tasks are accepted; running tasks are not affected.
+    delay_timer.stop_delay_timer()?;
+
+    Ok(())
+}
+
+fn build_task_async_print() -> Result<Task, TaskError> {
+    let mut task_builder = TaskBuilder::default();
+
+    let body = || async {
+        println!("create_async_fn_body!");
+
+        Timer::after(Duration::from_secs(3)).await;
+
+        println!("create_async_fn_body:i'success");
+    };
+
+    task_builder
+        .set_task_id(1)
+        .set_frequency_repeated_by_seconds(1)
+        .set_maximum_parallel_runnable_num(2)
+        .spawn_async_routine(body)
+}