For the convenience of XY-44AT core drill in large inclined angle and vertical drilling, based on the investigation on China-made series derricks, a drill rig erected by double derricking cylinder and cable stayed with translation structure of crane pulley and hydraulic aided hoister was designed. Connected with the derrick bottom and with the crane and steel cable stayed frame on its top, the rig can be simply operated, by which the service performance is further broadened to improve the production efficiency.