Wear-life forecast of self-lubricating spherical plain bearing has very great significance to the operating security of equipment. To meet the demand of wear-life calculation and forecast of self-lubricating spherical plain bearing, the wear-life models for self-lubricating thrust spherical plain bearing and self-lubricating radial spherical plain bearing were created based on the principle of joint wear calculation method and the wear mechanism of self-lubricating radial spherical plain bearing. The models proposed integrated the wear mechanism of self- lubricating radial spherical plain bearing, the friction wear laws of materials, configuration, mating characteristic of the self-lubricating spherical plain bearing, and function requirement. Especially, the configuration parameters and function requirement were more specific in the models to different types and functions of self-lubricating spherical plain bearing. Example results and analysis on the models showed that the model can calculate the wear life accurately, and it is more theoretical and has a good applicability to the special designed and applied self-lubricating spherical plain bearing compared with the experiential calculation formulas used at present.