Abstract: This work analyzed the strength characteristics of Enzyme Induced Carbonate Precipitation（EICP） for solidification of sandy soil. Firstly, the effects of pH and reaction time on urease activity were investigated. Subsequently, direct shear tests and unconfined compressive strength tests were conducted to analyze the effects of particle size distribution, cementation reagent, cementation ratio, curing period, and relative density on the strength characteristics of EICP solidified sand. The results showed that When pH=7, urease activity is the highest, which decreases with time. Sand graded 0.075 mm～0.25 mm has the best curing effect, and the most economical solution is a concentration of 1mol/L. When the concentration of calcium chloride is constant, the optimal cementation ratio is 1∶1. When the concentration of urea remains constant and the concentration of calcium chloride is between 0.5 and 1.5 times, the change in shear strength of solidified sand is relatively small. When the curing period is 3 days, the sand is basically completely solidified. When the relative density is between 0.5 and 0.7, the greater the relative density of EICP solidified sand, the greater its unconfined compressive strength. In the range of 0.5 mol/L～1.5 mol/L. The unconfined compressive strength of EICP solidified sand increases with the increase of the concentration of cementation solution.