According to dc current has larger low-order harmonics with Current-Source PWM Rectifier under distorted and unblalanced condition, traditional control strategy needs complex separating positive and negative sequence components, rotating transition of coordinate and decoupling control. Constant dc current control strategy is put forward without PLL with Current Source PWM Rectifier in this paper. By using derived power outer-loop control with dc current square, constant dc current control substitute traditional PI control. In current inner-loop using proportion resonant and harmonic compensation realize grid current no error following. That control algorithms basing on the stationary frame simplify control without complex separating positive and negative sequence components, rotating transition of coordinate and decoupling control. Simulation and experiment show that proposed control method is correctness.