In order to solve the problem of wireless network formation efficiency optimization and evaluation based on aircraft onboard directional antenna, a quantification evaluation model is proposed considering the particularities requirements of war-craft wireless network application. The use of the model firstly defines the network formation, analyzes the factors of network formation efficiency, then picks up evaluation indexes of transmission speed, time delay, network robust, stealth and special data link requirements, followed with respective quantification formulas for each index. Finally, a given network example is defined and evaluated using the model. Experiment shows that the network efficiency evaluation model proposed in this paper is effective and feasible.