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One of the effective ways to increase the speed of amphibious vehicle is to reduce the overall resistance. In order to research the influence of trim angle on the resistance characteristics, a numerical calculation method is used to research the resistance characteristics of high speed wheeled amphibious vehicle. The numerical results are in good agreement with the experimental results. The research results show that the resistance increases with the increase in speed when the vehicle trim angle is small; it increases first and then tends to be stable with the increase in speed when the vehicle trim angle is bigger. When the speed is low, the trim angle has a small influence on longitudinal resistance ; when the speed is higher, the resistance decreases first and then increases with the increase in trim angle. As speed increases, the vehicle trim angle becomes smaller, but the resistance increases. [ABSTRACT FROM AUTHOR]