diff --git a/.changeset/thick-monkeys-call.md b/.changeset/thick-monkeys-call.md
new file mode 100644
index 0000000000..3567c3eed2
--- /dev/null
+++ b/.changeset/thick-monkeys-call.md
@@ -0,0 +1,5 @@
+---
+'@ice/plugin-rax-compat': patch
+---
+
+fix: user compilation config lose
diff --git a/packages/plugin-rax-compat/src/index.ts b/packages/plugin-rax-compat/src/index.ts
index 43bf4ced5c..76e1e1f0ee 100644
--- a/packages/plugin-rax-compat/src/index.ts
+++ b/packages/plugin-rax-compat/src/index.ts
@@ -97,9 +97,14 @@ const plugin: Plugin<CompatRaxOptions> = (options = {}) => ({
         type: false,
       });
 
+      // TODO: optimize the logic, support deep merge in plugin API.
+      // Must create a variable to store the original compilationConfig.
+      const originalSwcCompilationConfig = typeof config.swcOptions?.compilationConfig === 'object'
+        ? cloneDeep(config.swcOptions?.compilationConfig || {})
+        : {};
       const compilationConfigFunc = typeof config.swcOptions?.compilationConfig === 'function'
         ? config.swcOptions?.compilationConfig
-        : () => config.swcOptions?.compilationConfig;
+        : () => originalSwcCompilationConfig;
 
       // Reset jsc.transform.react.runtime to classic.
       config.swcOptions = merge(config.swcOptions || {}, {