A synchronized control strategy based on Kalman filter is proposed to solve the problem of coordination control of distributed power and grid connection between microgrid and big grid smoothly and quickly. Kalman filter algorithm is used to predict whether the next state meets the requirements of the grid connection by calculating the difference value between the previous state and the current state of the microgrid. It realizes that microgrid is connected to the grid quickly and smoothly. The simulation results show the effectiveness of the proposed scheme.