Combining the freezing method construction of side channels of the test section of Nanjing subway, the paper gave the analysis and summary for some technical problems and countermeasures of the freezing method in different construction stages such as construction of freezing pipes, freezing, excavation and so forth, discussion was made on the variation rules of the temperature in the freezing, deformation of the ground surface and stress of frost upheaval, the conclusion can be reference for future freezing method construction and monitoring of side channels in Nanjing subway.