Abstract: In order to solve high difficult system maintenance in the application process of the electro-hydraulic control system applied to the hydraulic powered support and hard to on time remove the system failure and others, the paper introduced the fault diagnosis status of the electro-hydraulic control and systematically analyzed the failure mode and failure mechanism of the electro-hydraulic control system. With the classification, conclusion and summarized extraction on the failure information of the electro-hydraulic control system, a fault tree of the electro-hydraulic control system was established. From the basic working principle of the electro-hydraulic control system, with the basic function conducted by each component of the electro-hydraulic control system as the basis, the discrimination criterion of the fault identification was provided and a plan design on the fault diagnosis system of the electro-hydraulic control system was completed. A failure analysis was conducted on the powered support controller and matched sensor as well as the executive unit. Meanwhile,the identification method of the relevant fault was provided. An implementation plan on the interface visualization of the fault diagnosis system software was provided. The fault diagnosis technology of the electro-hydraulic control system for the powered support was widely applied to the Hongliulin Mine, Bayan Gaole Mine and other several mines and the failure of the electro-hydraulic control system for the powered support could be timely removed.