Aiming at the low efficiency, low generality, and easily involving local optimal resolving of tradition fire power distribution, the model of the fire power distribution based on improved genetic algorithms is established. Through analyzing the missile fire power distribution in multi-armies cooperation fighting, use “generalized value” as parameter to construct mathematics model, and adopt improved genetic algorithm to resolve. Validate efficiency of model and algorithm through simulation. The simulation result shows that the algorithm is useful, and can give reference to the missile fire power distribution in cooperation fight.