In actual engineering applications,the leader-follower algorithm can't solve the problem of collisions during the formation of unmanned surface vehicle. Planning the initial state of the formation is frequently needed in advance,which could prevent the collision among unmanned surface vehicle formations. Aiming at this defect,the velocity obstacle algorithm is introduced into the leader-follower algorithm,and the threat evaluation is introduced into the velocity obstacle algorithm to solve the collision problems of unmanned surface vehicles during formation. In this paper,a motion simulation platform of the unmanned surface vehicle is established,and the simulation test of the unmanned surface vehicle formation control strategy proposed in this paper has been carried out. Simulation tests show that the algorithm improves the stability of formation control and reduces the risk of collision during formation.