diff --git a/internal/controller/library.go b/internal/controller/library.go
index b3de030..6c43bbc 100644
--- a/internal/controller/library.go
+++ b/internal/controller/library.go
@@ -51,6 +51,21 @@ func (c *LibraryController) Create(w http.ResponseWriter, r *http.Request) {
 	jsonMsg(w, "Add library successfully.")
 }
 
+func (c *LibraryController) GetByID(w http.ResponseWriter, r *http.Request) {
+	idParam := chi.URLParam(r, "id")
+	id, err := strconv.Atoi(idParam)
+	if err != nil {
+		jsonError(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	l, err := c.service.GetByID(id)
+	if err != nil {
+		jsonError(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	jsonResponse(w, l, http.StatusOK)
+}
+
 func (c *LibraryController) UpdateName(w http.ResponseWriter, r *http.Request) {
 	idParam := chi.URLParam(r, "id")
 	id, err := strconv.Atoi(idParam)
diff --git a/internal/controller/song.go b/internal/controller/song.go
index aeb6ed4..94e916f 100644
--- a/internal/controller/song.go
+++ b/internal/controller/song.go
@@ -25,6 +25,21 @@ func (c *SongController) GetAllWithDetails(w http.ResponseWriter, r *http.Reques
 	jsonResponse(w, songs, http.StatusOK)
 }
 
+func (c *SongController) GetByIDWithDetails(w http.ResponseWriter, r *http.Request) {
+	paramID := chi.URLParam(r, "id")
+	id, err := strconv.Atoi(paramID)
+	if err != nil {
+		http.Error(w, "无效的歌曲 ID", http.StatusBadRequest)
+		return
+	}
+	song, err := c.service.GetByIDWithDetails(id)
+	if err != nil {
+		jsonError(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	jsonResponse(w, song, http.StatusOK)
+}
+
 func (c *SongController) Stream(w http.ResponseWriter, r *http.Request) {
 	paramID := chi.URLParam(r, "id")
 	id, err := strconv.Atoi(paramID)
diff --git a/internal/repository/song_repo.go b/internal/repository/song_repo.go
index ce052a9..acc8e48 100644
--- a/internal/repository/song_repo.go
+++ b/internal/repository/song_repo.go
@@ -63,6 +63,21 @@ func (r *SongRepository) GetAllWithDetails() ([]SongDetail, error) {
 	return songs, nil
 }
 
+func (r *SongRepository) GetWithDetails(id int) (model.SongDetail, error) {
+	var song model.SongDetail
+	err := r.db.QueryRow(`
+		SELECT s.id, s.title, a.name as artist_name, al.title as album_title, s.duration, mf.path
+		FROM songs s WHERE id = ?
+		INNER JOIN media_files mf ON s.media_file_id = mf.id
+		INNER JOIN artists a ON s.artist_id = a.id
+		INNER JOIN albums al ON s.album_id = al.id
+	`, id).Scan(&song.ID, &song.Title, &song.Artist, &song.Album, &song.Duration, &song.Path)
+	if err != nil {
+		return model.SongDetail{}, err
+	}
+	return song, nil
+}
+
 func (r *SongRepository) Get(id int) (model.Song, error) {
 	var song model.Song
 	err := r.db.QueryRow(`
diff --git a/internal/service/song_svc.go b/internal/service/song_svc.go
index 5f2b853..63e5e0f 100644
--- a/internal/service/song_svc.go
+++ b/internal/service/song_svc.go
@@ -25,6 +25,10 @@ func (s *SongService) GetAllWithDetails() ([]repository.SongDetail, error) {
 	return s.songRepo.GetAllWithDetails()
 }
 
+func (s *SongService) GetByIDWithDetails(id int) (repository.SongDetail, error) {
+	return s.songRepo.GetWithDetails(id)
+}
+
 // GetMediaFilePath returns the file path of a song by its song ID.
 func (s *SongService) GetMediaFile(id int) (model.MediaFile, error) {
 	song, err := s.songRepo.Get(id)
diff --git a/main.go b/main.go
index 52ad768..de4cd9b 100644
--- a/main.go
+++ b/main.go
@@ -37,16 +37,18 @@ func main() {
 	r.Route("/api/libraries", func(r chi.Router) {
 		r.Get("/", libraryController.GetAll)
 		r.Post("/", libraryController.Create)
+		r.Get("/{id}", libraryController.GetByID)
+		r.Delete("/{id}", libraryController.Delete)
 		r.Put("/{id}/name", libraryController.UpdateName)
 		r.Put("/{id}/path", libraryController.UpdatePath)
 		r.Post("/{id}/scan", libraryController.Scan)
-		r.Get("/scan-status", libraryController.GetScanStatus)
-		r.Delete("/{id}", libraryController.Delete)
 		r.Get("/{id}/songs", libraryController.GetSongs)
+		r.Get("/scan-status", libraryController.GetScanStatus)
 	})
 
 	r.Route("/api/songs", func(r chi.Router) {
 		r.Get("/", songController.GetAllWithDetails)
+		r.Get("/{id}", songController.GetByIDWithDetails)
 		r.Get("/{id}/stream", songController.Stream)
 		r.Get("/{id}/cover", songController.Cover)
 	})