The rotation axis of a fiveaxis vertical and horizontal machining center is driven by a torque motor. The rotation axis’ release and clamping functions are realized by a hydraulic transmission circuit. Due to the hydraulic system design shortage, during the release process of the rotating axis torque motor, the hydraulic system’〖KG-*2〗s dynamic response is delayed, and the positioning error and clamping failure of the rotating axis occur. Facing the dynamic response’〖KG-*2〗s lag problem of the rotation axis for hydraulic release and clamping, an optimized and modified scheme was proposed to improve the stability of the hydraulic system in four aspects: hydraulic system, subroutine application, numerical control system and mechanical structure. Effectively, the upper problems in application are solved, and the parts’ hidden quality problems during production are avoided.