The prospect and quality of industrial robots depend on their reliability. However

the reliability of industrial robots in China needs improving. In this paper

three ways of making reliable distribution are put forward for industrial robot systems. The least effort and proportion distribution method is suitable for the industrial robot system that has been newly made

and it has been put in use and put in production to enhance its reliability. The mixed distribution method is a simple way of reliability distribution of an industrial robot system. It is fit for making system reliability distribution in the development of new industrial robots and without restrictions to achieve high reliability. The two-level optimizing distribution method is a reliability optimizing distribution method with restriction. Researches on these three reliability distribution methods of industrial robot systems as a critical part in the reliability design not only has a theoretical research value

but also has an important and practical value.