Abstract: It has gained the obvious effectiveness that applying the EPS heat insulating boards to the foundation of hydraulic structures can resist the frost heave damage of the foundation, the EPS heat insulating foundation is observed for four winters and springs and the temperature field of the foundation is analyzed by in-situ simulating in the field,and the observation data are obtained. The test result validates the feasibility that the EPS heat insulating foundation method can reduce the frost heave from the analysis of temperature field changing laws with different density and different thickness of the EPS heat insulation foundation. It can offer referring gist for consummating the anti-frozen theory and practical experiences.