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It needs to choose the initial launching angle for guided rockets with impact angle constraint, in order to attack the target vertically, in this way, it can reduce the amount of control to a large extent. In this paper, it models and simulates using circle trajectory guidance law for a certain type of guided rocket and optimizes the trajectory using optimization software which is Isight. It gets the best launching angle guaranteeing a minimum amount of control effort when launching angle is design variables and control is regarded as the objective function at the same time. The simulation results show that it is apparent that the simulation does the deed and the selection of simulation parameter is reasonable, it can also verify the effectiveness of the circular trajectory guidance law, and the optimization effect is obvious.