Abstract: Through analysis of mechanical chracterictics of constant load and pump load,the paper established mathematic model of torque slope and current-limited staring mode for asynchronous motor.In the algorithm of torque slope and current-limited starting mode,closed torque loop adopted traditional control of PID,closed current-limited loop used fuzzy control,and applied Matlab to simulate.The simulation result showed that the mathematic model of torque slope and current-limited starting mode were correct and effective,control mode achieved preconcerted effect.