Research conclusions : The four kinds of embankments can adjust the energy of radiation, convection and conduction by changing the structure and filler of subgrade. The cool reserves of the four kinds of embankment are increased; the thermal regimes of permafrost foundation，improved. They are the effective engineering measures to protect the permafrost and are applicable to embankment engineering in permafrost zone. The length of subgrade is 380. 30 km along Qinghai-Tibet railway in the permafrost regions, and the lengths of sir-cooled riprap embankment , slope protection of rubble and crushed stone subgrade and heat pipe embankment are respectively 117. 69 km, 127.00 km and 32.0 km. The testing engineering of active protection contractures had experienced at least six freeze-thaw cycles, and the diseases of thawing and sinking did not appeared. The train is stable running with 100 km/h in permafrost regions, which shows the active protection contractures are stability and reliability.