diff --git a/src/service/local.rs b/src/service/local.rs
index c4ef99acfde7..92aa8847812b 100644
--- a/src/service/local.rs
+++ b/src/service/local.rs
@@ -176,6 +176,14 @@ pub fn define_command_line_options(mut app: Command) -> Command {
             .requires("SERVER_ADDR")
             .help("SIP003 (https://shadowsocks.org/guide/sip003.html) plugin"),
     )
+    .arg(
+        Arg::new("PLUGIN_MODE")
+            .long("plugin-mode")
+            .num_args(1)
+            .action(ArgAction::Set)
+            .requires("PLUGIN")
+            .help("SIP003/SIP003u plugin mode, must be one of `tcp_only` (default), `udp_only` and `tcp_and_udp`"),
+    )
     .arg(
         Arg::new("PLUGIN_OPT")
             .long("plugin-opts")
@@ -623,7 +631,9 @@ pub fn create(matches: &ArgMatches) -> Result<(Runtime, impl Future<Output = Exi
                     plugin: p,
                     plugin_opts: matches.get_one::<String>("PLUGIN_OPT").cloned(),
                     plugin_args: Vec::new(),
-                    plugin_mode: Mode::TcpOnly,
+                    plugin_mode: matches.get_one::<String>("PLUGIN_MODE")
+                        .map(|x| x.parse::<Mode>().expect("plugin-mode must be one of `tcp_only` (default), `udp_only` and `tcp_and_udp`"))
+                        .unwrap_or(Mode::TcpOnly),
                 };
 
                 sc.set_plugin(plugin);
diff --git a/src/service/manager.rs b/src/service/manager.rs
index ebf7a2ff8eae..83c6ee03294c 100644
--- a/src/service/manager.rs
+++ b/src/service/manager.rs
@@ -95,6 +95,14 @@ pub fn define_command_line_options(mut app: Command) -> Command {
                 .value_hint(ValueHint::CommandName)
                 .help("Default SIP003 (https://shadowsocks.org/guide/sip003.html) plugin"),
         )
+        .arg(
+            Arg::new("PLUGIN_MODE")
+                .long("plugin-mode")
+                .num_args(1)
+                .action(ArgAction::Set)
+                .requires("PLUGIN")
+                .help("SIP003/SIP003u plugin mode, must be one of `tcp_only` (default), `udp_only` and `tcp_and_udp`"),
+        )
         .arg(
             Arg::new("PLUGIN_OPT")
                 .long("plugin-opts")
@@ -377,7 +385,9 @@ pub fn create(matches: &ArgMatches) -> Result<(Runtime, impl Future<Output = Exi
                     plugin: p,
                     plugin_opts: matches.get_one::<String>("PLUGIN_OPT").cloned(),
                     plugin_args: Vec::new(),
-                    plugin_mode: Mode::TcpOnly,
+                    plugin_mode: matches.get_one::<String>("PLUGIN_MODE")
+                        .map(|x| x.parse::<Mode>().expect("plugin-mode must be one of `tcp_only` (default), `udp_only` and `tcp_and_udp`"))
+                        .unwrap_or(Mode::TcpOnly),
                 });
             }
 
diff --git a/src/service/server.rs b/src/service/server.rs
index 6f1fa842f878..7c32c98fe205 100644
--- a/src/service/server.rs
+++ b/src/service/server.rs
@@ -123,6 +123,14 @@ pub fn define_command_line_options(mut app: Command) -> Command {
                 .requires("SERVER_ADDR")
                 .help("SIP003 (https://shadowsocks.org/guide/sip003.html) plugin"),
         )
+        .arg(
+            Arg::new("PLUGIN_MODE")
+                .long("plugin-mode")
+                .num_args(1)
+                .action(ArgAction::Set)
+                .requires("PLUGIN")
+                .help("SIP003/SIP003u plugin mode, must be one of `tcp_only` (default), `udp_only` and `tcp_and_udp`"),
+        )
         .arg(
             Arg::new("PLUGIN_OPT")
                 .long("plugin-opts")
@@ -358,7 +366,9 @@ pub fn create(matches: &ArgMatches) -> Result<(Runtime, impl Future<Output = Exi
                     plugin: p,
                     plugin_opts: matches.get_one::<String>("PLUGIN_OPT").cloned(),
                     plugin_args: Vec::new(),
-                    plugin_mode: Mode::TcpOnly,
+                    plugin_mode: matches.get_one::<String>("PLUGIN_MODE")
+                        .map(|x| x.parse::<Mode>().expect("plugin-mode must be one of `tcp_only` (default), `udp_only` and `tcp_and_udp`"))
+                        .unwrap_or(Mode::TcpOnly),
                 };
 
                 sc.set_plugin(plugin);