diff --git a/os/src/fs/stdio.rs b/os/src/fs/stdio.rs
index 30846aa2..a869e82c 100644
--- a/os/src/fs/stdio.rs
+++ b/os/src/fs/stdio.rs
@@ -25,7 +25,7 @@ impl File for Stdin {
                 continue;
             } else if c == 3 {
                 // 3 is ctrl_c
-                println!("[K] os/fs/stdio/read: Got Ctrl_C");
+                //println!("[K] os/fs/stdio/read: Got Ctrl_C");
                 current_add_signal(SignalFlags::SIGINT);
                 break;
             } else {
diff --git a/os/src/task/mod.rs b/os/src/task/mod.rs
index fb62d755..0a4f9f5e 100644
--- a/os/src/task/mod.rs
+++ b/os/src/task/mod.rs
@@ -95,10 +95,10 @@ pub fn add_initproc() {
 pub fn check_signals_error_of_current() -> Option<(i32, &'static str)> {
     let task = current_task().unwrap();
     let task_inner = task.inner_exclusive_access();
-    println!(
-        "[K] check_signals_error_of_current {:?}",
-        task_inner.signals
-    );
+    // println!(
+    //     "[K] check_signals_error_of_current {:?}",
+    //     task_inner.signals
+    // );
     task_inner.signals.check_error()
 }
 
@@ -106,10 +106,10 @@ pub fn current_add_signal(signal: SignalFlags) {
     let task = current_task().unwrap();
     let mut task_inner = task.inner_exclusive_access();
     task_inner.signals |= signal;
-    println!(
-        "[K] current_add_signal:: current task sigflag {:?}",
-        task_inner.signals
-    );
+    // println!(
+    //     "[K] current_add_signal:: current task sigflag {:?}",
+    //     task_inner.signals
+    // );
 }
 
 fn call_kernel_signal_handler(signal: SignalFlags) {
@@ -127,10 +127,10 @@ fn call_kernel_signal_handler(signal: SignalFlags) {
             }
         }
         _ => {
-            println!(
-                "[K] call_kernel_signal_handler:: current task sigflag {:?}",
-                task_inner.signals
-            );
+            // println!(
+            //     "[K] call_kernel_signal_handler:: current task sigflag {:?}",
+            //     task_inner.signals
+            // );
             task_inner.killed = true;
         }
     }
@@ -161,7 +161,7 @@ fn call_user_signal_handler(sig: usize, signal: SignalFlags) {
         trap_ctx.x[10] = sig;
     } else {
         // default action
-        println!("[K] task/call_user_signal_handler: default action, kill current process");
+        //println!("[K] task/call_user_signal_handler: default action, kill current process");
     }
 }
 
diff --git a/os/src/trap/mod.rs b/os/src/trap/mod.rs
index 4aa58c77..2ad558cc 100644
--- a/os/src/trap/mod.rs
+++ b/os/src/trap/mod.rs
@@ -86,7 +86,7 @@ pub fn trap_handler() -> ! {
         }
     }
     // handle signals (handle the sent signal)
-    println!("[K] trap_handler:: handle_signals");
+    //println!("[K] trap_handler:: handle_signals");
     handle_signals();
 
     // check error signals (if error then exit)
diff --git a/user/src/bin/sig_ctrlc.rs b/user/src/bin/sig_ctrlc.rs
index 81b3aadf..4a9e732e 100644
--- a/user/src/bin/sig_ctrlc.rs
+++ b/user/src/bin/sig_ctrlc.rs
@@ -12,7 +12,7 @@ const LF: u8 = 0x0au8;
 const CR: u8 = 0x0du8;
 
 fn func() {
-    println!("signal_handler: caught signal SIGINT， and exit(1)");
+    println!("signal_handler: caught signal SIGINT, and exit(1)");
     exit(1);
 }