In order to solve the problem of low efficiency and poor flexibility in solving Reynolds equation by the traditional finite difference method,a difference algorithm based on the hierarchical idea was proposed to solve the Reynolds equation model.The variable step Reynolds equation difference calculation model was set up first,and then the thinning region algorithm based on the pressure gradient change and the region integral value was developed.Finally,the solution process and method of the adaptive variable step difference algorithm were realized.This method uses the hierarchical idea to continuously correct the initial coarse mesh,and simulate and construct adaptive grid that satisfies the target,which effectively avoids the problem of blind refinement mesh of the traditional equivalent mesh method in order to improve the accuracy of the solution.The results of different models show that the adaptive variable step length difference algorithm based on the hierarchical idea can obtain better surface of oil film pressure with smaller degree of freedom compared with the traditional finite difference algorithm.It has a significant improvement in efficiency and flexibility.