Abstract: The structural properties of naturally soft clay soils change during freezing temperatures,which in turn change the mechanical properties of the soil and pose a potential risk to the safe operation of the actual project. Natural soft clay has certain structural properties,and its mechanical properties will change during the low-temperature freezing process,which will create hidden dangers to engineering safety. In order to explore the changing law of the mechanical properties of structured soft clay under freezing conditions,artificially prepared structured soft clay was used as the object,and the effects of temperature,moisture content,confining pressure,and structural strength on its stress-strain relationship,failure strength,shear strength index,and elastic modulus are discussed. The test results show that the stress-strain relationship curve of structural soft clay under different influencing factors has its own characteristics,among which there is an optimal moisture content,which maximizes the peak stress of the soil. The failure strength decreases linearly with the increase of temperature. The shear strength index c and φ value decrease with the increase of temperature. The increase in structural strength has a limited effect on the increase in cohesion c. The angle of internal friction φ decreases linearly with its increase. Through regression analysis,a prediction formula for elastic modulus under different temperatures and confining pressures is constructed. Finally,based on the variance analysis of the orthogonal experiment,the primary and secondary order of the influence of each factor on the failure strength is structural strength,temperature,moisture content,and confining pressure. The research results can provide reference and guidance for actual engineering.