With the development of the quality of life and the modern intelligent buildings,building is always equipped with multiple elevators for the improvement of the service quality and the reliability.However,the increasing of the number of elevators merely not only couldn't meet the multi-object need,but also causes serious problems of the environmental pollution and the energy cost and the low operating efficiency.To meet the development of the high-rise buildings and the elevator group control,this paper studies the multi-objective.elevator group control systems.Due to the complexity of the system,it is necessary to use the optimal dispatch method.By analyzing the multi-object need of the group control system.The thesis establishes the multi-objective optimization model,proposes the identification method of the traffic pattern,and provides scheduling strategy and group control method under different traffic pattern to enhance system's performance. .The multiple fuzzy comprehensive judgement algorithmofgroup control of elevators based on GE PLC.Te result of simulation shows that the algorithm is effective.