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Build-up welding material of brake disc and asbestos-free material of brake block for drilling rig are developed.The research indicates that brake pair has better frictional characteristics in variable temperature as well as heat-fade resistance performance in high temperature.Wear-resisting performance of brake disc is comparatively stable under high temperature.Load has less influence on frictional coefficient of brake pair and brake block has comparatively stable wear-resisting performance.Frictional coefficient of brake pair increases and tends to stabilize gradually along with sliding speed increasing.Initial heat-fading occurs in brake block material along with frictional temperature rising during frictional process,secondary solidification may happen when frictional temperature reach a value,thus a stable friction layer on frictional surface of brake block forms and accordingly enhances its tribological performance.