A calculation method of static load capacity for three-row roller slewing bearing considering clearances was proposed. The statics models of the slewing bearing in the radial direction and the axial direction were established respectively. By solving the equilibrium equations of the models, the rolling element loads were calculated. Based on the load distribution of the rollers, the static load capacity of the bearing was calculated and the influences of the clearances on it were researched. Results show that slight negative axial clearance is favorable for the static load capacity of the bearing.