diff --git a/src/analysis.ts b/src/analysis.ts
index 921beb3..365c144 100644
--- a/src/analysis.ts
+++ b/src/analysis.ts
@@ -18,6 +18,8 @@ export interface CompilationDatabaseAnalysis {
   directory?: string;
   arguments?: string[];
   hasPrebuiltModules?: boolean;
+  modulePcmSourceDirectories?: string[];
+  modulePcmConsumerDirectories?: string[];
   reason: string;
 }
 
@@ -56,6 +58,13 @@ interface CompilationCommand {
   command?: unknown;
 }
 
+interface CompilationCandidate extends CompilationDatabaseAnalysis {
+  moduleInterface: boolean;
+  projectSource: boolean;
+  moduleCompatibilityKey: string;
+  prebuiltModuleDirectory?: string;
+}
+
 function unavailable(reason: string): CompilationDatabaseAnalysis {
   return {
     kind: "unknown",
@@ -145,6 +154,37 @@ function compilerKind(compilerPath: string): CompilerKind {
   return "unknown";
 }
 
+function prebuiltModuleDirectory(arguments_: readonly string[]): string | undefined {
+  const flag = arguments_.find((argument) => argument.startsWith("-fprebuilt-module-path="));
+  if (flag === undefined) {
+    return undefined;
+  }
+  const value = flag.slice("-fprebuilt-module-path=".length);
+  return value.length >= 2 && value.startsWith('"') && value.endsWith('"')
+    ? value.slice(1, -1)
+    : value;
+}
+
+function moduleCompatibilityKey(arguments_: readonly string[]): string {
+  const result: string[] = [];
+  for (let index = 1; index < arguments_.length; index += 1) {
+    const argument = arguments_[index];
+    if (argument === "-c" || argument === "-o" || argument === "-I") {
+      index += 1;
+      continue;
+    }
+    if (
+      argument.startsWith("-I")
+      || argument.startsWith("-fmodule-file=")
+      || argument.startsWith("-fprebuilt-module-path=")
+    ) {
+      continue;
+    }
+    result.push(argument);
+  }
+  return result.join("\0");
+}
+
 export function analyzeCompilationDatabase(contents: string): CompilationDatabaseAnalysis {
   let parsed: unknown;
   try {
@@ -157,7 +197,7 @@ export function analyzeCompilationDatabase(contents: string): CompilationDatabas
     return unavailable("compile_commands.json 至少需要包含一条编译命令");
   }
 
-  const candidates: CompilationDatabaseAnalysis[] = [];
+  const candidates: CompilationCandidate[] = [];
 
   for (const value of parsed) {
     if (value === null || typeof value !== "object") {
@@ -183,6 +223,10 @@ export function analyzeCompilationDatabase(contents: string): CompilationDatabas
     const sourceFile = typeof command.file === "string"
       ? resolveCompilationSourceFile(directory, command.file)
       : undefined;
+    const moduleInterface = /\.(?:cppm|ixx|mpp|ccm)$/i.test(sourceFile ?? "");
+    const projectSource = directory !== undefined
+      && sourceFile !== undefined
+      && isProjectSource(directory, sourceFile);
     candidates.push({
       kind,
       capability: kind === "llvm" ? "full" : "syntax-only",
@@ -191,6 +235,10 @@ export function analyzeCompilationDatabase(contents: string): CompilationDatabas
       directory,
       arguments: args,
       hasPrebuiltModules,
+      moduleInterface,
+      projectSource,
+      moduleCompatibilityKey: moduleCompatibilityKey(args),
+      prebuiltModuleDirectory: prebuiltModuleDirectory(args),
       reason: kind === "llvm"
         ? "Clang 编译命令可以由 clangd 使用"
         : `${kind.toUpperCase()} 模块产物不能由 clangd 使用`,
@@ -201,17 +249,41 @@ export function analyzeCompilationDatabase(contents: string): CompilationDatabas
     return unavailable("compile_commands.json 不包含受支持的编译器命令");
   }
 
-  const score = (candidate: CompilationDatabaseAnalysis): number => {
+  const score = (candidate: CompilationCandidate): number => {
     const sourceFile = candidate.sourceFile ?? "";
-    const moduleInterface = /\.(?:cppm|ixx|mpp|ccm)$/i.test(sourceFile);
     const inProject = candidate.directory !== undefined && isWithinDirectory(candidate.directory, sourceFile);
     return (inProject ? 200 : 0)
-      + (candidate.directory !== undefined && isProjectSource(candidate.directory, sourceFile) ? 200 : 0)
-      + (moduleInterface ? 100 : 0)
+      + (candidate.projectSource ? 200 : 0)
+      + (candidate.moduleInterface ? 0 : 100)
       + (candidate.hasPrebuiltModules ? 10 : 0);
   };
 
-  return candidates.reduce((best, candidate) => (score(candidate) > score(best) ? candidate : best));
+  const selected = candidates.reduce(
+    (best, candidate) => (score(candidate) > score(best) ? candidate : best),
+  );
+  const uniqueDirectories = (moduleInterface: boolean): string[] => [...new Set(
+    candidates
+      .filter((candidate) => (
+        candidate.kind === "llvm"
+        && candidate.projectSource
+        && candidate.moduleInterface === moduleInterface
+        && candidate.compilerPath === selected.compilerPath
+        && candidate.moduleCompatibilityKey === selected.moduleCompatibilityKey
+      ))
+      .flatMap((candidate) => candidate.prebuiltModuleDirectory ?? []),
+  )];
+  const {
+    moduleInterface: _moduleInterface,
+    projectSource: _projectSource,
+    moduleCompatibilityKey: _moduleCompatibilityKey,
+    prebuiltModuleDirectory: _prebuiltModuleDirectory,
+    ...analysis
+  } = selected;
+  return {
+    ...analysis,
+    modulePcmSourceDirectories: uniqueDirectories(true),
+    modulePcmConsumerDirectories: uniqueDirectories(false),
+  };
 }
 
 function isWithinDirectory(directory: string, file: string): boolean {
diff --git a/src/extension.ts b/src/extension.ts
index 0d26e3d..db7efa2 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -61,6 +61,7 @@ import {
   type ModuleSetupBlockedReason,
   type ModuleSetupStepResult,
 } from "./moduleSetup";
+import { stageAvailableProjectPcms } from "./pcm";
 
 const COMMAND_CONFIGURE = "mcpp.configureClangd";
 const COMMAND_REFRESH = "mcpp.refreshCompilationDatabase";
@@ -187,6 +188,22 @@ function hasUsableCompilationDatabase(project: McppProjectDiscovery): boolean {
   return loadProjectContext(project)?.analysis.capability !== "unavailable";
 }
 
+function stageProjectPcms(context: ProjectContext, output: vscode.OutputChannel): boolean {
+  try {
+    const copied = stageAvailableProjectPcms(context.analysis);
+    if (copied > 0) {
+      appendOutputLine(output, `[PCM] 已为模块消费者暂存 ${copied} 个现有 PCM。`);
+    }
+    return copied > 0;
+  } catch (error) {
+    appendOutputLine(
+      output,
+      `[PCM] 暂存现有 PCM 失败：${error instanceof Error ? error.message : String(error)}`,
+    );
+    return false;
+  }
+}
+
 function moduleSetupBlockedMessage(reason: ModuleSetupBlockedReason): string {
   switch (reason) {
     case "project-toolchain-override":
@@ -578,6 +595,10 @@ async function runModuleSupportCheck(
     return moduleStatus;
   }
 
+  if (stageProjectPcms(context, output)) {
+    await restartClangd(output);
+  }
+
   const checkToken = moduleCheckOperations.begin(context.project.root);
   moduleStatusByProject.delete(context.project.root);
   if (shouldRenderProjectStatus(findCurrentProject()?.root, context.project.root)) {
@@ -800,6 +821,7 @@ async function autoConfigureModulesWizard(
         return { stage: "reload", state: "failed", detail: "无法重新加载 mcpp 工程。" };
       }
       currentContext = refreshed;
+      stageProjectPcms(currentContext, output);
       updateStatusBar(status, currentContext);
       if (currentContext.analysis.capability !== "full" || currentContext.analysis.kind !== "llvm") {
         return {
@@ -1032,6 +1054,9 @@ export async function activate(extensionContext: vscode.ExtensionContext): Promi
       }
     }
 
+    if (workspaceAllowsToolExecution(vscode.workspace.isTrusted)) {
+      forceRestart ||= stageProjectPcms(context, output);
+    }
     updateStatusBar(status, context);
 
     const configured = await configureClangd(
diff --git a/src/pcm.ts b/src/pcm.ts
new file mode 100644
index 0000000..c0a1d27
--- /dev/null
+++ b/src/pcm.ts
@@ -0,0 +1,44 @@
+import { copyFileSync, existsSync, mkdirSync, readdirSync, statSync } from "node:fs";
+import path from "node:path";
+import process from "node:process";
+
+import type { CompilationDatabaseAnalysis } from "./analysis";
+
+function sameDirectory(left: string, right: string): boolean {
+  const normalize = (value: string): string => {
+    const resolved = path.resolve(value);
+    return process.platform === "win32" ? resolved.toLowerCase() : resolved;
+  };
+  return normalize(left) === normalize(right);
+}
+
+export function stageAvailableProjectPcms(analysis: CompilationDatabaseAnalysis): number {
+  const sources = analysis.modulePcmSourceDirectories ?? [];
+  const destinations = analysis.modulePcmConsumerDirectories ?? [];
+  let copied = 0;
+
+  for (const sourceDirectory of sources) {
+    if (!existsSync(sourceDirectory)) {
+      continue;
+    }
+    const pcms = readdirSync(sourceDirectory, { withFileTypes: true })
+      .filter((entry) => entry.isFile() && entry.name.toLowerCase().endsWith(".pcm"));
+    for (const destinationDirectory of destinations) {
+      if (sameDirectory(sourceDirectory, destinationDirectory) || pcms.length === 0) {
+        continue;
+      }
+      mkdirSync(destinationDirectory, { recursive: true });
+      for (const pcm of pcms) {
+        const source = path.join(sourceDirectory, pcm.name);
+        const destination = path.join(destinationDirectory, pcm.name);
+        if (existsSync(destination) && statSync(source).mtimeMs <= statSync(destination).mtimeMs) {
+          continue;
+        }
+        copyFileSync(source, destination);
+        copied += 1;
+      }
+    }
+  }
+
+  return copied;
+}
diff --git a/test/analysis.test.ts b/test/analysis.test.ts
index 521b429..6b230b0 100644
--- a/test/analysis.test.ts
+++ b/test/analysis.test.ts
@@ -57,6 +57,51 @@ test("prefers a project module interface over an earlier external command", () =
   assert.equal(result.hasPrebuiltModules, true);
 });
 
+test("checks a project module consumer and records its separate PCM directory", () => {
+  const result = analyzeCompilationDatabase(JSON.stringify([
+    {
+      directory: "/work/app",
+      file: "/work/app/src/demo.cppm",
+      arguments: [
+        "/tools/clang++",
+        "-std=c++23",
+        "-O0",
+        "-fprebuilt-module-path=/work/app/target/build/pcm.cache",
+        "-c",
+        "/work/app/src/demo.cppm",
+      ],
+    },
+    {
+      directory: "/work/app",
+      file: "/work/app/tests/demo_test.cpp",
+      arguments: [
+        "/tools/clang++",
+        "-std=c++23",
+        "-O0",
+        "-fprebuilt-module-path=/work/app/target/test/pcm.cache",
+        "-c",
+        "/work/app/tests/demo_test.cpp",
+      ],
+    },
+    {
+      directory: "/work/app",
+      file: "/work/app/tests/release_test.cpp",
+      arguments: [
+        "/tools/clang++",
+        "-std=c++23",
+        "-O2",
+        "-fprebuilt-module-path=/work/app/target/release/pcm.cache",
+        "-c",
+        "/work/app/tests/release_test.cpp",
+      ],
+    },
+  ]));
+
+  assert.equal(result.sourceFile, "/work/app/tests/demo_test.cpp");
+  assert.deepEqual(result.modulePcmSourceDirectories, ["/work/app/target/build/pcm.cache"]);
+  assert.deepEqual(result.modulePcmConsumerDirectories, ["/work/app/target/test/pcm.cache"]);
+});
+
 test("prefers a project source over an external module interface", () => {
   const result = analyzeCompilationDatabase(JSON.stringify([
     {
diff --git a/test/artifacts.test.ts b/test/artifacts.test.ts
index bf5baba..87b4f17 100644
--- a/test/artifacts.test.ts
+++ b/test/artifacts.test.ts
@@ -154,6 +154,15 @@ test("IDE commands expose progress and bound clangd restart waits", () => {
   assert.match(source, /output\.show\(true\)/);
 });
 
+test("module checks restore available PCM before invoking clangd", () => {
+  const source = readFileSync(path.join(root, "src/extension.ts"), "utf8");
+  const start = source.indexOf("async function runModuleSupportCheck");
+  const end = source.indexOf("async function updateModuleSupportForContext", start);
+  const method = source.slice(start, end);
+  assert.ok(method.indexOf("stageProjectPcms(context, output)") < method.indexOf("runClangdCheck("));
+  assert.match(method, /stageProjectPcms\(context, output\)[\s\S]*await restartClangd\(output\)/);
+});
+
 test("ships syntax-only C++ highlighting for the exact build.mcpp filename", () => {
   const manifest = JSON.parse(readFileSync(path.join(root, "package.json"), "utf8")) as PackageManifest;
   const associations = manifest.contributes?.configurationDefaults?.["files.associations"] as
diff --git a/test/pcm.test.ts b/test/pcm.test.ts
new file mode 100644
index 0000000..ba2141f
--- /dev/null
+++ b/test/pcm.test.ts
@@ -0,0 +1,54 @@
+import assert from "node:assert/strict";
+import {
+  existsSync,
+  mkdirSync,
+  mkdtempSync,
+  readFileSync,
+  rmSync,
+  utimesSync,
+  writeFileSync,
+} from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import test from "node:test";
+
+import { stageAvailableProjectPcms } from "../src/pcm";
+
+test("stages missing and newer module PCMs for a consumer", () => {
+  const root = mkdtempSync(path.join(os.tmpdir(), "mcpp-vscode-pcm-"));
+  const source = path.join(root, "build", "pcm.cache");
+  const destination = path.join(root, "test", "pcm.cache");
+  try {
+    mkdirSync(source, { recursive: true });
+    mkdirSync(destination, { recursive: true });
+    writeFileSync(path.join(source, "mcpplibs.demo.pcm"), "module");
+    writeFileSync(path.join(source, "std.pcm"), "std");
+    writeFileSync(path.join(destination, "std.pcm"), "existing");
+
+    const copied = stageAvailableProjectPcms({
+      kind: "llvm",
+      capability: "full",
+      reason: "test",
+      modulePcmSourceDirectories: [source],
+      modulePcmConsumerDirectories: [destination],
+    });
+
+    assert.equal(copied, 1);
+    assert.equal(existsSync(path.join(destination, "mcpplibs.demo.pcm")), true);
+    assert.equal(readFileSync(path.join(destination, "std.pcm"), "utf8"), "existing");
+
+    writeFileSync(path.join(source, "std.pcm"), "updated");
+    const newer = new Date(Date.now() + 1_000);
+    utimesSync(path.join(source, "std.pcm"), newer, newer);
+    assert.equal(stageAvailableProjectPcms({
+      kind: "llvm",
+      capability: "full",
+      reason: "test",
+      modulePcmSourceDirectories: [source],
+      modulePcmConsumerDirectories: [destination],
+    }), 1);
+    assert.equal(readFileSync(path.join(destination, "std.pcm"), "utf8"), "updated");
+  } finally {
+    rmSync(root, { recursive: true, force: true });
+  }
+});