Abstract: Order to solve the problem that the cutter head of shield machine can′t cut the steel freezing pipe in the soil in the freezing reinforcement project of metro tunnel shield entry, it is proposed to use plastic pipe as the freezing pipe to realize direct cutting. To obtain the development law of freezing wall of plastic pipe during freezing, methods of physical model test and finite element model analysis are combined. The accuracy of finite element calculation model is verified by comparing data between numerical calculation results and model test results. Based on the model, the law of different factors influencing frozen wall is analyzed. Results show that: the development speed of freezing wall of PVC pipe is about 0.85 of that of steel pipe; when the PVC pipe is freezing, pipe diameter and initial ground temperature have certain impact on the freezing development speed, and the development speed of the freezing wall increases linearly with the increase of pipe diameter while decreases linearly with the increase of initial ground temperature; when the PVC pipe is freezing, saltwater temperature has evident impact on the development speed of freezing wall, demonstrating an approximate linear relationship. For every lowering 5℃ of saltwater temperature, frozen wall development speed increases by 6.2 mm/d.