Hydraulic support is one of the main equipment in fully mechanized process, its performance is directly related to the coal production efficiency and security. Finding hydraulic support common faults, taking measures to solve and prevent, means a lot to improve coal production and safe production. The main structure of hydraulic support was introduced, the reason of stents instability, the main structure damage, the bottom of the drill and the frame and a common failures such as die frame down automatically were analyzed, the corresponding measures were put forward. The prevention measures of support fault was put forward from the daily maintenance management, repair, overhaul management.