An improved Meanshiftbased rocket target tracking algorithm is presented. The traditional Meanshift tracker is difficult in tracking fast moving rocket target and suffers in cumulating error. To overcome the limitation of the traditional Meanshift tracking algorithm, threeframedifference method is employed to detect the rough position of rocket target. Based on the rough position, Meanshift algorithm is used to achieve precise tracking. Simulation experiments show that the proposed algorithm can effectively track fast moving rocket target and overcome the tracking error cumulating problems.