Abstract:Social robot is a new research hotspot of robot.After pectination of representative social robots,the development of social robot was generally summarized.In addition,the features of its function, the commercialization and the appearance were analyzed. Second,relevant theories and key technology to this area were expounded in detail,including theory of terrorist valley, artificial emotion ,sense technology,facial expression and speech recognition and synthesis.Finally, aiming at the limits in this field,the future development trends were outlined.