In order to estimate the impact point for ballistic missile rapidly, an impact point estimation method is proposed based on orbital elements handover. There are two kinds of orbital elements. One is computed by ground based multi-function phased array radar and the other one comes from warning center provided by long-range early warning phased array radar combined for precise orbit determination. The precise impact point can be offered if the impact point error accuracy is satisfied. The simulation results show that compared with traditional method, the proposed method can shorten the period of the predictable time by 40%.