In high-power drives， the switching frequency is even less than 1 kHz for low losses， but phase currents will contain huge harmonics. To solve it， this paper proposes the stator flux trajectory tracking （SFTT） based realization of synchronized space vector modulation （SSVM）， which can acquire both low harmonics and fast dynamics. First， the stable flux trajectory is formed for SSVM， and the feasibility of yielding synchronized pulses and fast dynamics by SFTT is explained. Second， a state observer in the hybrid frame is built to avoid the divergence of counterpart in the fixed frame， improving accuracy and stability of observer. Finally， the realization of SFTT is explained， where the control period is online optimized by minimizing rotor flux error. Experiments verify the proposed method can reduce current harmonics and track the torque command within 2 ms. The smooth transition between patterns with different pulse ratios is also realized.