The problem of Unmanned Aerial Vehicles (UAVs) cooperative searching in the uncertainty environment was studied.In order to realize target optimization,the models of uncertainty environment,the UAVs,network communication relationship and cooperative search/detect updating were established.A cooperative searching control method based on Uncertainty Value Reducing Maximization(UVRM) was presented.The problem of UAV cooperative searching in the uncertainty environment was solved by this control arithmetic,and the mathematic characteristic was proved.Simulation was made for control arithmetic of cooperative searching from different aspects.The simulation results show that the algorithm can not only implement cooperative search,but also ensure spreadability of the searching area and superiority of the searching time.