In aviation mission planning system, the accuracy of aircraft air-to-ground attack route solution, route generation quality and route calculation speed are important indicators to measure the capability of mission planning system. Aircraft air-to-ground attack route design is a typical multi constraint complex maneuver in aircraft route planning. In the process of design and use, it is subject to multi-dimensional constraints from time, space and aircraft body, which puts forward high requirements for flight dynamics modeling and track optimization. This paper uses object-oriented thinking to model the aircraft"s side-slip dynamics model, and realizes the design and optimization of the complex maneuvering process by the way of route maneuvering splicing and segmental optimization. After simulation analysis, it is proved that the route optimization design can realize the multi-constrained trajectory design and planning function of the aircraft in terms of ideas and methods. The iterative optimization algorithm has good convergence, and the model and algorithm can meet the requirements of aviation mission planning.