Abstract: Based on single-phase voltage regulator with controllable phase and amplitude（VRCPA）,a three-phase VRCPA without 3rd harmonic notch filter was proposed according to the three-phase symmetrical principle.The three-phase VRCPA is comprised of two parts which are used to continuously adjust the phase and amplitude of three-phase output voltage respectively.The operation principle of three-phase VRCPA,its control parameter relationship of extreme phase angle,control accuracy of phase angle and curves for selecting control parameters were studied and analyzed in detail.As the curve followed for dynamically selecting closed-loop control parameters,the substituted curve is simpler,easier to implement and has higher control stability,better continuity for control parameter changing,smaller fluctuation and error for phase angle adjustment than the curve of extreme phase angle.The control strategy of the three-phase VRCPA was presented and a prototype was made.The experimental waveforms and testing results verified the correctness of the theoretical analysis and the feasibility of the control strategy.