Biological intelligence (human intelligence) and artificial intelligence (machine intelligence) have their good points, respectively and they also have strong advantage complementarity. With the aid of all kinds of humanmachine interface technologies and methods, human intelligence and artificial intelligence are combined to form a new powerful hybrid intelligence, which will provide a significant theory innovation and breakthrough in technology. This paper firstly introduces the main research directions, key technology problems and major research contents of humanmachine intelligence. Then, further introduction is made to illustrate the applications and promoting actions of humanmachine intelligence synergy technology in the fields of service, medical and rehabilitation robot. Finally, the possible problems and challenges existing in the applications are analyzed, and conclusion is made.