To solve the problem of high sampling rate and uncertain switching frequency in finitecontrolset, odel predictive control (FCSMPC) of threephase voltage type pulse width modulation (PWM) rectifier, a kind of constant switching frequency method was proposed. The voltage of AC side of rectifier which would be effected in the next sampling period was obtained by solving cost function, then the voltage would be produced by using space vector pulse width modulation method to achieve constant switching frequency. Simulation and experimental results showed that the proposed control algorithm had constant switching frequency, low harmonic content and the rectifier operates with high power factor.