diff --git a/src/config.rs b/src/config.rs
index 84309af..7c04ee7 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -2,5 +2,5 @@ use serde::{Serialize, Deserialize};
 
 #[derive(Serialize, Deserialize)]
 pub struct DockerBuildConfig {
-
+    image: Option<String>,
 }
\ No newline at end of file
diff --git a/src/docker_util.rs b/src/docker_util.rs
index a8bd684..92a3b79 100644
--- a/src/docker_util.rs
+++ b/src/docker_util.rs
@@ -82,9 +82,10 @@ impl DockerCmd {
         };
 
         let mut sub_cmd = String::with_capacity(1024);
-        if let Some(mirror) = self.mirror {
-            sub_cmd.push_str(&make_cmd(&mirror));
+        if let Some(mirror) = &self.mirror {
+            sub_cmd.push_str(&make_cmd(mirror));
             sub_cmd.push_str("\n");
+            success!("Build crates mirror: {}", mirror);
         }
 
         let mut builder_cmd = builder_name;
@@ -101,16 +102,22 @@ impl DockerCmd {
         }
         cmds_iter.for_each(|c| { sub_build_cmd.push(c.clone()); });
 
-        sub_cmd.push_str(&builder_cmd);
-        sub_cmd.push(' ');
-        sub_cmd.push_str(&sub_build_cmd.iter().map(|arg| escape_arg(arg)).collect::<Vec<_>>().join(" "));
+        let mut final_sub_cmd = String::with_capacity(512);
+        final_sub_cmd.push_str(&builder_cmd);
+        final_sub_cmd.push(' ');
+        final_sub_cmd.push_str(&sub_build_cmd.iter().map(|arg| escape_arg(arg)).collect::<Vec<_>>().join(" "));
+        sub_cmd.push_str(&final_sub_cmd);
 
         fs::write(DCOLER_TEMP_CMD, &sub_cmd).ok();
 
         cmd.args(vec!["bash", DCOLER_TEMP_CMD]);
 
         success!("Docker cmd exec: {:?}", cmd);
-        success!("Docker temp sub cmd: {}", sub_cmd);
+        if let Some(mirror) = &self.mirror {
+            success!("Build crates mirror: {}", mirror);
+        }
+        success!("Build command: {}", final_sub_cmd);
+        debugging!("Docker temp sub cmd: {}", sub_cmd);
         let r = util_cmd::run_command_and_wait(&mut cmd).map_err(|e| e.into());
         fs::remove_file(DCOLER_TEMP_CMD).ok();
         r
diff --git a/src/main.rs b/src/main.rs
index 8a0ff5d..75cc24d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,17 +7,18 @@ mod docker_util;
 
 use std::fs;
 use std::env;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use rust_util::util_file;
 pub use docker_util::DockerCmd;
 
-const DOCKER_REGISTRY: &str = "~/.dockerbuild/register/rust_1_47";
 const MIRROR_USTC: &str = "git://mirrors.ustc.edu.cn/crates.io-index";
 
 fn main() {
     information!("dockerbuild v0.1");
 
-    let docker_registry_path_buf = util_file::get_absolute_path(DOCKER_REGISTRY).expect("Cannot find $HOME !");
+    let docker_image = "rust:1.47";
+
+    let docker_registry_path_buf =get_resolved_docker_registry(docker_image).expect("Cannot find $HOME !");
     let docker_registry = docker_registry_path_buf.to_str().expect("Cannot find $HOME !!");
 
     let p = Path::new(&docker_registry);
@@ -30,9 +31,28 @@ fn main() {
 
     let args_iter = env::args().skip(1);
     let args = args_iter.map(|a| a.to_owned()).collect::<Vec<_>>();
-    let mut docker_cmd = DockerCmd::new("rust:1.47");
+    let mut docker_cmd = DockerCmd::new(docker_image);
     docker_cmd.add_volumn(docker_registry, "/usr/local/cargo/registry")
               .mirror(MIRROR_USTC);
     docker_cmd.exec(&args).unwrap();
 }
 
+fn get_resolved_docker_registry(image: &str) -> Option<PathBuf> {
+    util_file::get_absolute_path(&get_docker_registry(image))
+}
+
+fn get_docker_registry(image: &str) -> String {
+    let mut registry = "~/.dockerbuild/register/".to_owned();
+    for c in image.chars() {
+        match c {
+            'a'..='z' | 'A'..='Z' | '0'..='9' => registry.push(c),
+            _ => registry.push('_'),
+        }
+    }
+    registry
+}
+
+#[test]
+fn test_get_docker_registry() {
+    assert_eq!("~/.dockerbuild/register/rust_1_47", get_docker_registry("rust:1.47"));
+}