diff --git a/v2rayN/ServiceLib.Tests/Fmt/ShadowsocksFmtTests.cs b/v2rayN/ServiceLib.Tests/Fmt/ShadowsocksFmtTests.cs
new file mode 100644
index 00000000..f43cc73e
--- /dev/null
+++ b/v2rayN/ServiceLib.Tests/Fmt/ShadowsocksFmtTests.cs
@@ -0,0 +1,19 @@
+namespace ServiceLib.Tests.Fmt;
+
+public class ShadowsocksFmtTests
+{
+    // SIP002 user info that is not base64 is "method:password", percent-encoded once.
+    [Test]
+    [Arguments("ss://2022-blake3-aes-128-gcm:p%2541ss@1.2.3.4:8388#demo", "p%41ss")]
+    [Arguments("ss://2022-blake3-aes-128-gcm:p%25ss@1.2.3.4:8388#demo", "p%ss")]
+    [Arguments("ss://2022-blake3-aes-128-gcm:a%3Ab%2Fc%2B%3D@1.2.3.4:8388#demo", "a:b/c+=")]
+    public async Task ResolveConfig_PlainUserInfo_ShouldDecodePasswordOnce(string shareUri, string password)
+    {
+        var resolved = FmtHandler.ResolveConfig(shareUri, out var msg);
+
+        await resolved.Should().NotBeNull().Because($"uri: {shareUri}, msg: {msg}");
+        await resolved!.ConfigType.Should().BeEqualTo(EConfigType.Shadowsocks);
+        await resolved.GetProtocolExtra().SsMethod.Should().BeEqualTo("2022-blake3-aes-128-gcm");
+        await resolved.Password.Should().BeEqualTo(password);
+    }
+}
diff --git a/v2rayN/ServiceLib/Handler/Fmt/ShadowsocksFmt.cs b/v2rayN/ServiceLib/Handler/Fmt/ShadowsocksFmt.cs
index ab805002..a003540a 100644
--- a/v2rayN/ServiceLib/Handler/Fmt/ShadowsocksFmt.cs
+++ b/v2rayN/ServiceLib/Handler/Fmt/ShadowsocksFmt.cs
@@ -165,7 +165,7 @@ public class ShadowsocksFmt : BaseFmt
                 return null;
             }
             item.SetProtocolExtra(item.GetProtocolExtra() with { SsMethod = userInfoParts.First() });
-            item.Password = Utils.UrlDecode(userInfoParts.Last());
+            item.Password = userInfoParts.Last();
         }
         else
         {