Abstract: Objective: Under the mechanism of thermal expansion and cold contraction, the pile plate concrete structure is prone to crack due to the uneven distribution of internal forces. It is necessary to clarify the stress law of the bearing plate in the pile\|plate structure under the temperature field effect of tram lines, especially those in deep soft soil layers. Method: Based on the pile plate structure roadbed engineering of Songjiang modern tram demonstration line, the temperature field distribution law of rail pile plate structure in deep soft soil foundation is obtained by placing thermometer, reinforcement meter and strain meter in the bearing plate of the engineering site. According to the conversion method of internal force calculation based on steel reinforcement, the distribution law of internal force of the pile plate structure under different temperature fields is clarified, and the measured data on site is compared and analyzed with the theoretical analysis calculation of internal force value on the load\|bearing plate section. Result &Conclusion: There is a positive correlation between the axial force of the bearing plate and the relative temperature difference with the bearing plate, and the bending moment of the bearing plate is also positively correlated with the temperature of the upper and lower surfaces of the bearing plate. The internal force of the bearing plate undergoes periodic changes, and its deformation is always in the elastic stage under the influence of temperature force. After assigning a certain stiffness spring to the boundary, the calculated internal force values of each section of the bearing plate of the pile plate structure are in good agreement with those based on the measured data of the steel bars.