Introduces the basic principle of indirect torque control, and through the method of dynamic magnetic field weakening technology and SVPWM modulation algorithm extends the indirect torque control to the full speed zone. On the basis of simulation research makes comparative study on the flux and torque waveform which got by the proposed algorithm and the traditional control algorithm. The results show: the dynamic magnetic field weakening technology will make the torque response time shorten and speed up the control system response, thus proves that the fast torque control algorithm for the asynchronous motor has good performance of torque and current control.