Two　different　heaping　weld　materials　of　brake-disc　were　obtained　by　optimization　process,　and　two　different　materials　of　brake-block　were　developed.　All　the　developed　heaping　weld　materials　of　brake-disc　and　brake-block　materials　were　screened　and　matched　by　experimental　investigation　of　variable　temperature　friction　and　wear　characteristics　with　an　MMW-1　friction　and　wear　tester.　The　tribological　properties　of　the　braking　discs　and　blocks　were　comparatively　evaluated　as　well.　As　a　result,　the　tribological　performance　of　the　braking　pair　was　affected　to　some　extent　by　the　matching　of　the　frictional　pair　materials.　The　two　different　heaping　weld　material　discs　matched　with　the　two　brake-blocks　showed　higher　average　frictional　coefficient　and　thermal　frictional　coefficient　as　well　as　good　wear-resistance　at　high　temperature.　The　best　tribological　behavior　was　observed　for　the　frictional　pair　composed　of　the　second　welding　material　and　the　second　asbestos-free　brake　block　material.　Thus,　this　frictional　pair　could　be　screened　and　selected　as　the　optimum　disc-block　braking　pair　to　be　used　in　drilling　rig.