Abstract: In this paper ,FLUENT software is utilized to simulate the hydroplaning process of three kinds of differ-ent vehicle tires ,i .e .tires with the longitudinal texture ,horizontal texture and multi texture ;the relative parameters such as the dynamic water pressure ,the vehicle speed and the water film thickness are calculated .The results of simula-tion show that :(a) Among the three different kinds of tires ,one with the multi texture has the best hydroplaning resist-ant property while one with longitudinal texture has the worst anti-hydroplaning performance ;(b) The dynamic water pressure increases with the increasing vehicle speed when the water thickness remains stable ,and the increasing rate of dynamic water pressure increases with the driving speed as well ;(c) The dynamic water pressure increases with the thickness of water on condition that the vehicle speed remains stable .Based on the principle that the hydroplaning phe-nomenon occurs while the dynamic water pressure is equal to the internal pressure of vehicle tires ,the relationship be-tween the critical hydroplaning speed and the thickness of water film is established in this paper .Then ,based on the ex-isting equation of water film thickness ,the relationship between the critical hydroplaning speed and the precipitation is al-so calculated .