In order to solve the problem of the formation and configuration of the construction machinery of the emergency military road in the engineering unit of the synthetic army in wartime, the genetic algorithm is used to solve the problem. According to the requirements of building emergency military road in wartime mobile engineering support, this paper analyzes the task of building emergency military road, establishes the optimal allocation model of construction machinery by using the method of integer linear programming, and gives the optimal allocation and application efficiency of equipment, and verifies it through an example. The analysis results show that this method provides an optimization way for the engineering unit of synthetic forces to construct the emergency military road construction machinery, and improves the accuracy of the optimal allocation of construction machinery.