Abstract: Aim\ To study the calculation method of wear resistant reliable life of mechanical parts Methods\ According to reliability theory, a mathematical model for wear resistant reliable life was developed, and the wear rate of a mechanical part through a studied apparatus of on line measurements of accelerated wear for sliding thrust bearings were obtained Results\ Using the measured wear rate and the developed mathematical model, the scientific theory and calculation method of wear resistant reliable life of mechanical parts, which were based on precision measurements, were established Conclusion\ This theory and method will be universally available to wear resistant reliable life estimation for mechanical parts