Polarization control with fast response speed is highly desired in optical communication systems, such as in related studies of polarization scrambling and polarization stabilization. However, due to the influence of materials and structure, current polarization controller can only reach nanoseconds at the fastest, which becomes the main bottleneck of polarization-related research. In this paper, a novel optical structure based on low-speed electronic polarization controller and high-speed phase modulator is introduced to realize ultrafast polarization control. The changing trajectory of polarization state on Poincare Sphere caused by slow amplitude difference change and simultaneous fast phase difference change of two orthogonal projects is demonstrated and analyzed experimentally. This method greatly improves the response speed of polarization control and provides strong support for better performance of the polarization scrambling and polarization stabilization.