In the article, through the studies on the statues of brag-lha-klu-phug in Lhasa, combining with Chinese and Tibetan documents, the author makes a further exploration into its date, artistic style and the relations with the Buddhist art of the neighbourhood. Apart from the influence of the art of grottos in Hexi Area, the traditional cultural relations between Tubo and Nepal, India also should be xonsidered. The styles of statues, the Grotto of Tubo dynasty is closet to that of the Buddhist art of Nepal.