In the sight of friction hoist machine transmission characteristics, analysis of the possibility of friction hoist machine sliding ropes phenomenon, sliding ropes phenomenon can be divided into safety slide and dangerous slide two states. In order to avoid the occurrence of the friction hoist machine container overwind, overfall major accident caused by steel wire ropes dangerous slide, using two encoders to sample the speed of friction hoist machine wheel and the actual speed of steel wire ropes, concluding and analyzing the sliding ropes state of friction machine, according to the hoist container position and sliding ropes trend when the steel wire ropes of friction hoist machine start to slide, determining the dangerous state of sliding ropes. Designed the sliding ropes hydraulic brake device, with the adjustable sliding ropes brake torque and fast dynamic response control function, preventing the hoist container overwind, overfall major accident, as the same time, minimizing the machinery injury to the steel wire ropes when the sliding ropes are braked, realizing flexible sliding ropes brake.