Low-speed electric brake control strategy of the induction motor is described. The cause of the torque deviation in low-speed electric brake in practical applications is analyzed. A three-dimensional surface plot of the ratio of the given torque to the actual torque is created by MATLAB when the rotor field orientation angle deviates. The torque of motor is inaccurate because the rotor field orientation deviates during low-speed electric braking. In order to solve the problem, the reactive power model based rotor time constant adaptive algorithm is adopted. The experiment demonstrates that the algorithm can correct the rotor field orientation deviation and has good dynamic performance. The performance meets the requirement of the metro.