The Duke of Shiping niche,dedicated by the Bhikku Huicheng for his deceased father,is located at a conspicuous place on the north wall of Guyang Cave,Longmen Grottoes.In the niche,sculptures and motifs carried forward the style from Yungang Grottoes and created Longmen style.The niche is a standard to judge images carved in the Northern Wei's Taihe period,a reference to analyse different stages of constructing the Guyang Cave,and an essential material for studying the relationship between the Yungang Grottoes and the Longmen Grottoes.However,"the Duke of Shiping"has not been identified by scholars over the years.To this end,this essay began with the list of official titles engraved on the the Duke of Shiping inscription,then studied relevant official titles and figures from the historical records.Together with the review of the the Duke of Shiping niche and its surrounding carving,this essay concludes that the Duke of Shiping's identity is Mutai,a dissenter of Northern Wei Emperor Xiaowen's idea of transferring capital to Luoyang,and the leader of Daijing Rebellion in the twentieth year of Northern Wei's Taihe period.