Based on the tested ground temperature

salt dilating and frost-heave deformation etc. in the subgrade filled by the sulphate saline soil in site in corps reclamation area of Xinjiang Autonomous Region

using the multiple linear regression theory in SPSS software

the paper discusses the rule of the salt dilating and frost-heave deformation

the factors affect the salt dilating and frost-heave deformation

and the calculation method of the salt dilating and frost-heave deformation occur in the sulphate saline soil subgrade. The main conclusions are as follows. ①In one freezing and melting cycle

the tested ground temperature—salt dilating deformation curve can be separated into three phases

and the property of each phase is different. ②When the ground temperate is going up

the factors affecting the salt dilating and frost-heave deformation and the calculation method of the deformation are different from it when the ground temperate is lowered down. ③In one freezing and melting cycle

the maximum salt dilating deformation in the subgrade occurred when the ground temperature rises; thus the formula based on the data tested during the temperature rises is recommended to calculate the maximum salt dilating deformation.