The　Zhongxinkeng　and　Xiaochiling　Sections　on　Longyan　G319　of　Fujian　Province　were　chosen　as　test　sections,　which　are　typical　accident　black　spots.　The　test　plan　with　concrete　vehicle　was　designd　on　long　downgrades.　Based　on　the　finite　element　analysis　about　test　data,　the　temperature-rising　laws　of　brake　pad　under　different　conditions,　such　as　different　gross　masses　of　truck,　brake　modes,　cooling　methods,　were　analyzed.　The　result　indicates　that　when　truck　runs　downhill,　the　temperature　of　the　pad　increases　wavelike　with　the　implementation　of　braking　behavior.　The　gross　mass,　the　functional　performance　of　brake　pad　and　road　linetype　combination　are　the　key　influence　factors　on　the　temperature　change　of　brake　pad.　The　temperature　is　decreased　by　engine　brake　at　low　gear　and　sprayed　brake　effectively.　The　braking　behavior　is　closely　related　with　road　conditions　and　linetype　combination.　The　simulation　result　of　temperature　field　with　finite　element　method　in　simple　state　is　quite　different　from　the　result　of　vehicle　test.　5　tabs,　20　figs,　8　refs.