The evaluation index system of the target value of battlefield is set up according to the real battlefield environments, establish the math mode of fire distribution, then the optimal scheme of fire distribution is find out by using genetic algorithm, finally evaluate the actual scheme according to the different of the fire benefit between the actual scheme and the optimal one. Then the evaluation result is obtained. Testified by the experiment, this method is scientifical, reasonable, easy to program in computer and has a good applying prospect in domain of evaluation about battlefield.