A new organicinorganic hybrid perovskite CH3NH3Pb0.5Sn0.5Br3 material was prepared by using the solution method. The structure, stability and optical properties were characterized by using Xray diffraction, thermal gravimetric, analysis ultravioletvisible absorption and Hall test. The results indicate that the prepared new material has a layered structure and can be decomposed at 251.6 ℃, while the optical absorption range is in the ultraviolet and visible range, it is a ptype semiconductor material and has the carrier mobility of 63.1 cm/V·s.