Abstract: The development and promotion of energysaving and environmentally friendly new energy vehicles has become an important initiative for the worlds automobile industry， and is of strategic significance for China to cope with the deterioration of environmental quality and to reshape its future technology. The battery swapping mode has a good development prospect and many advantages， such as shorten energy supplement time and relieve mileage anxiety， how to design the policies to promote it， advancement has become a key issue. In the context of the battery swapping mode， investigating the optimal price， output， profits of the new energy vehicle manufacturer under the models of battery swapping and charging vehicle and the governments optimal decisions by developing the Stackelberg game model. The results show: 1） battery leasing and use costs， environmental benefits， etc. can affect the profits of the new energy vehicle manufacturer and the governments decisions on subsidies and taxes relief; 2） implementing the consumer subsidy and taxes relief policies can improve the profits of the new energy vehicle manufacturer， social welfare and consumer surplus; 3） when the battery swapping vehicle sales price is lower than a certain threshold value， the effect of the taxes relief policy is better than consumer subsidy policy.

Key words: battery swapping mode; new energy vehicles; pricing strategy; social welfare; Stackelberg game