The purpose of this survey is to study the relation between principal's leader traits and power bases and the job satisfaction of mentally retarded classes teachers in Taiwan Provincial junior high schools and elementary schools which have mentally retarded classes. The method of this investigation makes use of a questionaire survey. According to the results of the research, we can conclude that (1) The better leader traits principals have, the more satisfaction teachers express with their Jobs. (2) The better way principals use their power, the more satisfaction teachers express with their Jobs. (3) The better leader traits principals have, the better way principals know how to use their power. (4) The expert power and leading ability are the main factors to porgnasticate how teachers satisfy their jobs.According to above results, my suggestions are that (1)The competitive examination and training of principals should set up the reference indication of leader traits. (2)We should increase the opportunities of principals' advanced study in order to develop their experts' knowledge. (3)Principals should use reference power and expert power more to lead subordinates.(4)Principals should use legitimate power and coercive power less in order to increase the organization ability.(5)Use leading ability and expert power well to increase the job satisfaction of mentally retarted classes teachers.