Abstract：Research purposes:To master the engineering features of the thermal rod subgrade and the cooling effect of the thermal rod timely for evaluating the engineering stability of the thermal rod subgrade of the Qinghai － Tibet railway in permafrost region，this paper makes the comparatively analysis of the geothermal field of natural hole，the left shoulder hole and right shoulder hole made between 2006 and 2009 of one thermal rod subgrade of the Qinghai － Tibet Railway and researches the cooling effect of the thermal rod subgrade．
Research conclusions:From the analysis it can be seen that the ground temperature in depth between 0 and 1.5meters varies greatly under the influence of the air temperature． The ground temperature of the shoulder hole between 1.5 and 10.0 meters decreases year by year because of the cooling effect of the thermal rod，.and in the first 2 to 3 years after the Qinghai－Tibet Railway being open to traffic，the ground temperature falls obviously．So the thermal rod can make the ground temperature down quickly to protect the permafrost．
牛东兴;李勇;熊治文;韩龙武. 青藏铁路多年冻土区热棒路基地温场分析[J]. 铁道工程学报, 2012, 29(9): 30-33.
NIU Dong － xing，LI Yong，XIONG Zhi － wen，HAN Long － wu. Analysis of Geothermal Field of Thermal Rod Subgrade of Qinghai－Tibet Railway in Permafrost Region. 铁道工程学报, 2012, 29(9): 30-33.
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2012, Vol. 29 
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