The whole antimissile process can be viewed as an iteratively process based on impact points forecasting which showes that impact points was mainly focused on by present research in the following way. The time-space requirements for impact points forecasting were analyzed, and 3 forecasting criterions were proposed. The antimissile single impact points forecasting model at 3 criterions was established, and the unknown variables of the model were changed into values which radar can measure. For shoot-look-shoot scenario and shoot-shoot scenario, antimissile multiple impact points forecasting and optimization model was gave at 3 criterions, and the calculating method of latest launch time was discussed. The impact of different look occasion was analyzed and modeled during impact points forecasting process. Partial theories and methods was exploratory research, related conclusions made may be benefits for antimissile sustained shooting decision making.