The wet friction pairs,the core component of the controllable starting device of the heavy scraper conveyor for mining,presents highly complex coupling characteristics such as liquid viscous friction,rough contact friction,heat generation,heat transfer and heat dissipation during the starting process,which poses great challenges to study the transient friction thermal characteristics.Taking the starting process of large size wet friction pairs in mining as the research object,the contact interface pressure and transient heat conduction model were constructed.Based on the dynamic change of interface pressure,the transient friction thermal characteristics of friction pairs were studied,the dynamic distribution law of non-uniform temperature field was revealed,the temperature difference between steel plate and friction plate was analyzed,and the experimental verification was carried out.The results show that the transient temperature field of the friction pairs is comprehensively affected by the contact interface pressure,relative speed and convective heat transfer.There is an obvious temperature gradient in the radial direction,showing an uneven distribution.The maximum value of temperature appears near the outer diameter,and the maximum temperature of the friction plate is only half of that of the steel plate.The simulation value is in good agreement with the experimental value,which can accurately predict the dynamic change law of temperature field,and lays a theoretical foundation for the study of transient thermal characteristics of large size friction pairs.