Spindle drilling rig, with mechanical transmission and hydraulic driving, is still a kind of main model widely used in China at present, hydraulic system is an important component of the whole rig. Aiming at the existing problems in the hydraulic system of deep hole spindle drilling rig, upgrading improvement was made and good effect was verified by practice. The main measures of optimization and upgrading of spindle rotary drilling rig and the practical application are introduced in this paper.