The work aims to investigate the effects of surface texture design and non-Newtonian characteristics of grease on sealing performance of grease seal pair, and obtain the optimal structural parameters and working conditions in texture design. Based on the Herschel-Bulkley rheological model of grease and the principle of non-contact mechanical seal, the viscose-temperature relationship of grease was fitted, and the linear groove texture was selected to establish the end seal model. The pressure distribution, temperature distribution and apparent viscosity distribution of seal end face flow field were obtained by numerical simulation. The influence law of different inclination angle and speed on seal clearance flow field was analyzed, and other factors affecting leakage, such as grease temperature, groove number, length, width, depth and seal clearance, were systematically explored.