In the sea embankment filling project,in order to find out the suitable mixing ratio of silt and sea sand,The methods of drying and adding quicklime was used to reduce the water content of the silt,and finds the moisture content which is easy to be broken and even. According to different quality ratio and different test regulations,samples are prepared,and different curing age is designed.In the corresponding age,direct shear test,compression test,unconfined compressive strength test and penetration test are used to select the appropriate mixing ratio for the actual project. The results show that the cohesion basically reaches the peak value,when the mixing ratio of sea sand and lime soil is 1:2,and the internal friction angle decreases with the increase of the proportion of lime soil. After curing for 28 days,it is close to the low compressibility soil,which also meets the engineering of low permeability requirements.