Abstract：Research purposes: Zhengzhou-Xi ?an Railway Passenger Dedicated Line is the fast ballastless track railway built in China and the section between Mianchi and Lingbao of it is a summit section with the unfavourable geological conditions of big ups and downs landform，coal mines goats, waste soils and deep collapsible loess along the line. The geological conditions can be made clear and the parameters of rock soil can be obtained by adopting geological integrated survey technologies, which has significance to construction of the line.
Research methods: Based on the system theory and control theory, the rational survey program is worked out, the rational survey method is selected, and many methods are adapted for the important objects to snake comparisons. In this paper, the method and technologies used for surveying geological conditions in this section are summed up.
Research results: The surveying work was complete in 2005 and the survey achievement has been appraised.
Research conclusions: The construction of about two years shows the result of geological survey conforms to the real geological conditions.
2007, Vol. 24 
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