To explore the relationship between the compressive strength and shear strength parameters of cement-mixed soil，we prepare the cement-mixed soil samples with different cement ratios，carry out the unconfined compressive strength test and fast shear test for each sample under different ages，obtain the parameters of compressive strength and shear strength of cement soil，analyze the variation law of strength parameters with cement ratio，determine the cement ratio of 16% and 0.50 water-cement ratio for the project，establish the relationships of unconfined compressive strength and cohesion，and unconfined compressive strength and deformation modulus of cement-mixed soil. The results show that the unconfined compressive strength and cohesion of cement-mixed soil samples increase with the cement ratio，and the unconfined compressive strength and cohesion present a linear relationship. The unconfined compressive strength and shear strength of soft soil mixed with cement obviously improve. The deformation modulus of muddy soil is less than the recommended value of code.