The pressure convergence criterion was employed when solving Reynolds equation discretely in the study of microtextured face mechanical seal until now.However,this criterion cant guarantee the accurate leakage rate in every case.Therefore,a numerical calculation method,based on double convergence criteria of pressure and inner/outer diameter flow conservation,was proposed.A numerical calculation model based on two-dimensional Reynolds equation considering JFO boundary condition,was developed for one calculation domain with cylindrical micro-pore.The opening forces and leakage rates were calculated with different convergence criteria.The results show that the leak rate is not calculated accurately because the mass conservation condition can，t be met explicitly while using the pressure convergence criterion only.While using the inner/outer diameter flow conservation convergence criterion only,the erroneous result may be led because the convergence criterion may be met at the initial iteration.Double convergence criteria combining the two criteria can ensure the correctness of leakage rate calculation results.