Abstract: The theory of viscous support was put forward to solve the problems with current support methods and materials (metal stent,bolting-wire mesh) which were extremely prone to failure and fracture when they were used in impact roadway with high stress. The core of viscous support theory required the support system to add viscoelastic materials. The damper was installed on the one end of the anchor cable to increase the viscosity of support system because viscoelastic materials could absorb and consume energy. Thus,it could be used to transfer energy to achieve the purpose of reducing damage,in other words,the mechanical energy caused by rock burst was converted into internal energy. Based on the theory above, the authors had developed a new viscous support product which was named as an impact-constant resistance anchor cable. The cable could have a large deformation when it was pulled to a certain forced state and absorbed the impact energy caused by rock burst. Using skp18-1/ 500 damper as an example,when it was pulled up to 220 kN,it would yield a large deformation,when the rock burst occurred,it could resist the maximum impact energy 50 000 J,that was verified through mechanics experiment. A new theory and method of roadway support had been proposed. It proved that the method could be used to absorb and transfer the impact energy and ensure the state of surrounding rock transited from a stable state to another stable state. These characteristics had been verified by mechanical property test and field application.