Aiming at the urgent requirement to improve the control performance of electric spindle, an improved control algorithm is given after integrating SVPWM (space vector pulse width modulation) technology into classical DTC (direct torque control). Stator flux linkage space position and u_d, u_q after Park inverse transformed are taken as the three inputs, and then converted into three phase voltage of dc-to-ac inverter to control the electric spindle efficiently under SVPWM control technology. By modulating the stator flux linkage running approximate circular trajectory on the electric spindle, the discrete data required for the test is calculated. After establishing the hardware circuit using DSP and IGBT module, the experiments of electric spindle electromagnetic vibration velocity and acceleration are conducted, and the experimental results show that the torque ripple obviously decreases in three directions of vibration velocity of each operation frequency, especially at 100-450 Hz the vibration amplitude of vibration acceleration significantly reduces in three directions. These verify that the control performance is improved by integrating SVPWM into DCT.