Based on the deterministic rough surface mechanical seal model reconstructed in reverse,a three-dimensional rough liquid film flow calculation model was established.The viscosity-temperature effect and fluid physical parameters are combined,and the flow velocity,end face pressure,temperature and phase state laws of smooth model and rough model are compared.At the same time,the influence of rough model on the vaporization phase transformation characteristics and key sealing performance parameters of liquid film seal under load and rotational speed was studied.The results show that the roughness model is more affected by temperature change,which increases from 478 K to 493 K.The phase distribution increases with the increase of temperature,and the vapor phase distribution in the rough model increases more at the same temperature,and the phase transformation degree reaches 100% after 493 K,and the maximum phase volume fraction increases by 11.73%.It can be concluded that with the increase of pressure,the vapor phase ratio decreases gradually,and the increase of rotational speed promotes the occurrence of vaporization.