Based on the operating mode of the stall parking of AC traction electric locomotives, a vector control system, with DC 110 V accumulator its power source, has been designed of a fuzzy self-adaptive PI speed controller. By controlling the rotational speed of the induction motor, a slow and steady movement of the AC traction locomotives has been realized in the process of stall parking. The final result of a modeling and simulation test for the control system based on MATLAB/Simulink shows that the vector control system based on the fuzzy self-adaptive PI has the following advantages: more efficient voltage utilization, less rotational speed errors and smaller overshoot, greater self-adaptive capacity for the system speed regulator, etc.