Abstract: The friction temperature rise state of friction components in wet clutch is closely related to vehicle performance. In this paper, a numerical model of temperature field was optimized, considering the groove cooling, local heat dissipation and time-varying friction coefficient on the contact surface, and introducing a heat exchange coefficient of equivalent convection between discs and an equivalent gain coefficient. The optimization model was solved and verified based on a finite difference method and experiment. Results show its better accurate and validity than the traditional model. During the stable period, the influence of rotational speed and oil pressure on the temperature field was also analyzed with an optimization model of the sliding temperature field. The influence of lubrication flow on the temperature rise characteristic of sliding friction was experimentally analyzed, and the temperature rise characteristics in deformation failure process were measured. The research results can provide a guiding for the fine simulation and control of the friction components in wet clutch.