diff --git a/user/Cargo.toml b/user/Cargo.toml
index 9044a4c..0c95325 100644
--- a/user/Cargo.toml
+++ b/user/Cargo.toml
@@ -1,6 +1,7 @@
-[workspace]
+[package]
+name = "ucore-user-programs"
+version = "0.1.0"
+authors = ["Runji Wang <wangrunji0408@163.com>"]
 
-members = [
-    "ucore-ulib",
-    "hello",
-]
\ No newline at end of file
+[dependencies]
+"ucore-ulib" = { path = "ucore-ulib" }
\ No newline at end of file
diff --git a/user/Makefile b/user/Makefile
index ec5f14e..52ebf0a 100644
--- a/user/Makefile
+++ b/user/Makefile
@@ -1,2 +1,5 @@
+# arch = {riscv32, x86_64}
+arch := riscv32
+
 all:
-	@RUST_TARGET_PATH=$(pwd) xargo build --target x86_64-blog_os
\ No newline at end of file
+	@RUST_TARGET_PATH=$(shell pwd) xargo build --target $(arch)-ucore
\ No newline at end of file
diff --git a/user/hello/Cargo.toml b/user/hello/Cargo.toml
deleted file mode 100644
index 28a5ac6..0000000
--- a/user/hello/Cargo.toml
+++ /dev/null
@@ -1,7 +0,0 @@
-[package]
-name = "hello"
-version = "0.1.0"
-authors = ["WangRunji <wangrunji0408@163.com>"]
-
-[dependencies]
-ucore-ulib = { path = "../ucore-ulib" }
diff --git a/user/riscv32-blog_os.json b/user/riscv32-ucore.json
similarity index 100%
rename from user/riscv32-blog_os.json
rename to user/riscv32-ucore.json
diff --git a/user/hello/src/main.rs b/user/src/bin/hello.rs
similarity index 100%
rename from user/hello/src/main.rs
rename to user/src/bin/hello.rs
diff --git a/user/ucore-ulib/src/syscall.rs b/user/ucore-ulib/src/syscall.rs
index 570e6c9..e537e4f 100644
--- a/user/ucore-ulib/src/syscall.rs
+++ b/user/ucore-ulib/src/syscall.rs
@@ -39,7 +39,7 @@ fn sys_call(id: usize, arg0: usize, arg1: usize, arg2: usize, arg3: usize, arg4:
             : "memory"
             : "volatile");
         #[cfg(target_arch = "x86_64")]
-            asm!("int 0x80"
+            asm!("int 0x40"
             : "={rax}" (ret)
             : "{rax}" (id), "{rdi}" (arg0), "{rsi}" (arg1), "{rdx}" (arg2), "{rcx}" (arg3), "{r8}" (arg4), "{r9}" (arg5)
             : "memory"
diff --git a/user/x86_64-blog_os.json b/user/x86_64-ucore.json
similarity index 100%
rename from user/x86_64-blog_os.json
rename to user/x86_64-ucore.json