Abstract: According to the principle of index system for weapon system: systemic principle, integrity principle, independence principle, the comparability principle, operational principle and the principle of combining qualitative with quantitative, the health index system of one complex weapon system is set up; the advantage of BPNN and the disadvantage of BP arithmetic is ananyzed, and one improved BP arithmetic is put forward; the BPNN structure of one complex weapon system is based; the health state of the complex weapon system is evaluated, and the rationality of index system is validated.

Key words: Weapon system, Neural network, Back propagation, Health management, Index system