Abstract: Abstract: In order to adapt to the situation of coal, to reduce procurement costs of coal mining enterprises, to increase the promotion and application of directional drilling, economic directional drilling rig was designed. The key components of the drilling system as downhole motor and pump motor were imported parts. The main components of drilling rig by localization or improving the standardization rate, the general rate, to reduce the cost. The rig has been widely used in many coal mine after it's successful development, the maximum hole depth reaches 600 meters, which shows that every technical performance target meets the requirements of the original design.