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The current of the non commutation phase will ripple when brushless DC motor commutates. The ripple of the phase current must cause the ripple of the torque.In order to obtain better brushless DC motor torque output characteristics, research of torque ripple for brushless DC motor is necessary.That can improve the control stability and precision of the system. Through the analysis of the reason of the torque ripple, joining the current predictive control algorithm on the basis of traditional PWM_ON_PWM modulation regulate current increase and decrease rate of off phase and open phase.Which can suppress the phase current ripple.Finally using the DSP implement such algorithm and verify the feasibility of the algorithm. Combining PWM_ON_PWM modulation strategywith the current prediction algorithm can effectively suppress commutation torque ripple by comparing the experimental data and waveform analysis.