In order to integrate the performance evaluation of UAV cooperative combat with the actual combat, the prediction of UAV cooperative combat process is studied. The characteristics of the UAV's mission in cooperative combat for ground reconnaissance and attacking are analyzed, and the Lanchester equation of UAV cooperative combat is designed. The Lanchester equations of UAV cooperative operation based on force reinforcement and under different payloads are designed.The simulation experiment proves the rationality and feasibility of the designed Lanchester equations for UAV cooperative operation.