Abstract：Research purposes: The rapid and safe running of train is the most important to the passenger dedicated line．Whether the reasonable track structure is adopted or not in extremely cold area directly influences the normal running of train．After the analysis of track structure type at home and abroad and considering the actual characteristics of Harbin—Qiqihaer Passenger Dedicated Line，the reasonable track structure type was chosen．
Research conclusions: The ballastless track structure was adopted in Harbin—Qiqihaer Passenger Dedicated Line，with the following merits：(1)It can prevent the subgrade frost heave effectively to satisfy the requirement of track regularity for running high—speed train；(2)It can solve the problem of difficult maintenance of track in winter with high maintenance cost；(3)It is easy to install and use the snow thawing equipment to guarantee the traffic safety．
2009, Vol. 26 
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