diff --git a/src/RouteArtifactState.php b/src/RouteArtifactState.php
index 84bd6d1..a5b95b0 100644
--- a/src/RouteArtifactState.php
+++ b/src/RouteArtifactState.php
@@ -8,21 +8,78 @@ class RouteArtifactState
 {
 	public function store(string $type, array $artifact): void
 	{
+		$previous = $this->loadPayload($type);
 		$payload = [
 			'timestamp' => time(),
 			'type' => $type,
 			'artifact' => $artifact,
+			'build' => is_array($previous['build'] ?? null) ? $previous['build'] : null,
 		];
 
-		$directory = dirname($this->getFilePath($type));
-		if (!is_dir($directory)) {
-			mkdir($directory, 0755, true);
-		}
-
-		file_put_contents($this->getFilePath($type), json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
+		$this->writePayload($type, $payload);
 	}
 
 	public function load(string $type): array
+	{
+		$data = $this->loadPayload($type);
+		return is_array($data['artifact'] ?? null) ? $data['artifact'] : [];
+	}
+
+	public function markBuild(string $type, array $changedFiles): void
+	{
+		$data = $this->loadPayload($type);
+		if (!is_array($data['artifact'] ?? null)) {
+			return;
+		}
+
+		$data['build'] = [
+			'generation' => time(),
+			'timestamp' => time(),
+			'changed_files' => $this->normalizeFiles($changedFiles),
+		];
+
+		$this->writePayload($type, $data);
+	}
+
+	public function clearBuild(string $type): void
+	{
+		$data = $this->loadPayload($type);
+		if (empty($data)) {
+			return;
+		}
+
+		$data['build'] = null;
+		$this->writePayload($type, $data);
+	}
+	public function coversChangedFiles(string $type, array $changedFiles): bool
+	{
+		if (empty($changedFiles)) {
+			return false;
+		}
+
+		$data = $this->loadPayload($type);
+		$build = is_array($data['build'] ?? null) ? $data['build'] : [];
+		$builtFiles = is_array($build['changed_files'] ?? null) ? $build['changed_files'] : [];
+		if (empty($builtFiles)) {
+			return false;
+		}
+
+		$built = array_fill_keys($this->normalizeFiles($builtFiles), true);
+		foreach ($this->normalizeFiles($changedFiles) as $file) {
+			if (!isset($built[$file])) {
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	public function has(string $type): bool
+	{
+		return file_exists($this->getFilePath($type));
+	}
+
+	private function loadPayload(string $type): array
 	{
 		$file = $this->getFilePath($type);
 		if (!file_exists($file)) {
@@ -30,16 +87,47 @@ class RouteArtifactState
 		}
 
 		$data = json_decode((string)file_get_contents($file), true);
-		if (!is_array($data)) {
-			return [];
-		}
-
-		return is_array($data['artifact'] ?? null) ? $data['artifact'] : [];
+		return is_array($data) ? $data : [];
 	}
 
-	public function has(string $type): bool
+	private function writePayload(string $type, array $payload): void
 	{
-		return file_exists($this->getFilePath($type));
+		$file = $this->getFilePath($type);
+		$directory = dirname($file);
+		if (!is_dir($directory)) {
+			mkdir($directory, 0755, true);
+		}
+
+		$tmpFile = $file . '.tmp.' . getmypid();
+		$json = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR);
+		if (file_put_contents($tmpFile, $json, LOCK_EX) === false) {
+			throw new \RuntimeException('Unable to write route artifact: ' . $tmpFile);
+		}
+
+		if (@rename($tmpFile, $file)) {
+			return;
+		}
+
+		// Windows rename() cannot replace an existing file.
+		if (is_file($file) && @unlink($file) && @rename($tmpFile, $file)) {
+			return;
+		}
+
+		@unlink($tmpFile);
+		throw new \RuntimeException('Unable to publish route artifact: ' . $file);
+	}
+
+	private function normalizeFiles(array $files): array
+	{
+		$normalized = [];
+		foreach ($files as $file) {
+			if (!is_string($file) || $file === '') {
+				continue;
+			}
+			$normalized[] = str_replace('\\', '/', realpath($file) ?: $file);
+		}
+
+		return array_values(array_unique($normalized));
 	}
 
 	private function getFilePath(string $type): string
diff --git a/src/Router.php b/src/Router.php
index b0de5a7..e544a06 100644
--- a/src/Router.php
+++ b/src/Router.php
@@ -214,6 +214,18 @@ class Router
 
 		$changedFiles = $container->get(HotReloadState::class)->consume();
 
+		$artifactState = $container->get(RouteArtifactState::class);
+		if (getenv('KIRI_FILE_BUILD') !== '1' && !empty($changedFiles) && $artifactState->coversChangedFiles(static::$type, $changedFiles)) {
+			$container->get(DataGrip::class)->reset(static::$type);
+			$router = $container->get(DataGrip::class)->get(static::$type);
+			if ($router->importArtifact($artifactState->load(static::$type))) {
+				$this->read_dir_file(APP_PATH . 'routes');
+				$this->reset($container);
+				$coordinator->done();
+				return;
+			}
+		}
+
 		// Worker 首次启动（无变更文件 + Master 已完成扫描）：
 		// 重新 include 路由文件（Router::get/post 显式注册） + 基于 Master 扫描清单重建注解路由
 		// 避免 opcache_compile_file，仅用 Reflection 重建路由，内存开销极小
@@ -232,7 +244,6 @@ class Router
 		$container->get(DataGrip::class)->reset(static::$type);
 
 		$scanner = $container->get(Kiri\Di\Scanner::class);
-		$artifactState = $container->get(RouteArtifactState::class);
 		$scanConfig = array_merge(
 			config('servers.reload.scan', []),
 			config('site.scanner', [])
@@ -241,12 +252,12 @@ class Router
 
 		$normalizedAppPath = str_replace('\\', '/', realpath(APP_PATH . 'app') ?: APP_PATH . 'app');
 		$normalizedRoutePath = str_replace('\\', '/', realpath(APP_PATH . 'routes') ?: APP_PATH . 'routes');
-		$routeChanged = false;
+		$routeChangedFiles = [];
 		$appChangedFiles = [];
 
 		foreach ($changedFiles as $changedFile) {
 			if (str_starts_with($changedFile, $normalizedRoutePath . '/')) {
-				$routeChanged = true;
+				$routeChangedFiles[] = $changedFile;
 				continue;
 			}
 
@@ -265,7 +276,7 @@ class Router
 		if ($canUseArtifact) {
 			$artifact = $artifactState->load(static::$type);
 			$router = $container->get(DataGrip::class)->get(static::$type);
-			$usedArtifact = $router->importArtifact($artifact, $appChangedFiles);
+			$usedArtifact = $router->importArtifact($artifact, array_merge($appChangedFiles, $routeChangedFiles));
 		}
 
 		// routes 目录中的显式路由文件必须每次重建路由表时重新 include。
diff --git a/src/RouterCollector.php b/src/RouterCollector.php
index f1d65cd..1d38049 100644
--- a/src/RouterCollector.php
+++ b/src/RouterCollector.php
@@ -282,10 +282,6 @@ class RouterCollector implements \ArrayAccess, \IteratorAggregate
 
 	public function importArtifact(array $artifact, array $excludeSourceFiles = []): bool
 	{
-		if (($artifact['has_closure_routes'] ?? false) === true) {
-			return false;
-		}
-
 		$entries = $artifact['entries'] ?? null;
 		if (!is_array($entries)) {
 			return false;