Many sets of elevator control system was designed by the method of intelligent fuzzy reasoning based on rockwell PLC for the difficulty of optimization control. Using weighted average of the three evaluation index of average by ladder less time, the average waiting ladder less time, long time wait ladder low rate as an evaluation function, on this basis fuzzy reasoning method was adopted to realize optimal operation of the elevator group control system.，and many sets of elevator monitoring interface was designed. Finally in rockwell laboratory the algorithm was verified to better achieve the optimal control of the elevator group control, and fully illustrated the elevator group control system based on fuzzy control was effective and feasible.