Abstract: With a mastery of the temperature field variation law of the freezing connecting aisle in an ultra-long subway tunnel, the temperature field of the frozen stratum can be predicted and analyzed, and the development of frozen wall be judged in advance. Taking the freezing construction of the ultra-long connecting aisle on Fuzhou metro Line 1 as the background, a 3D finite element numerical calculation model is established, and the accuracy of the calculation model is verified by comparing the numerical analysis at the freezing stage with the measured data. Based on the numerical calculation model, the influence of initial ground temperature, thermal conductivity and specific heat capacity on the temperature field is studied. The results show that the variation law of freezing temperature field can be divided into three stages: rapid temperature drop and phase transformation stage; temperature drop stage and soil temperature stability stage. The intersection time of freezing wall increases linearly with the initial ground temperature and specific heat capacity. When the initial ground temperature increases 5℃, the intersection time will be extended to 2 days, and the intersection time will be prolonged with the increase of specific heat capacity. Negative correlation exists between the intersection time of freezing wall and the coefficient of heat conductivity, for every 10% increase in the later, the intersection time will be shortened by 1 day.