The main reason to realize detailed planning is to combine flight control with fire control.In the paper one theoretical framework for realizing detailed planning is given.Firstly the threat constraints and fire control border constraints models are built up a 6-DOF motion equation of the fighter was given and the detailed planning problem was changed into an optimal control problem based on the constrains by taking the motion equation as the state equation.Secondly Legendre Pseudospectral Method (LPM) was introduced to convert the optimal control problem into a Nonlinear Programming (NLP) problem with constrains.By improving the C Code Feasible Sequential Quadratic Programming (CFSQP) algorithm optimal results of the NLP problem could be quickly obtained.Simulation studies show that this framework works very well.