The analysis and evaluation of air - to - ground engagement effect is a kernel portion of the air - to - ground engagement simulation training system, and also is a very difficult problem. Through deep research, a method for evaluation of air - to - ground engagement effect is provided based on DIS / HLA simulation and sub - phase partition with weight. By using this method, two different air - to - ground engagement effects can be evaluated. This method proved to be practical and reliable in application.