Abstract: A large amount of cheap hydraulic fill silt and sand in coastal land reclamation project will be generated,meanwhile,the road construction project in this region needed a large number of expensive building materials such as cement stabilized crushed stone.In view of these problems,different stabilized mixtures of hydraulic fill silt and sand were used to replace the traditional construction materials;and the unconfined compressive strength and microstructure of stabilized soil were studied.Resultsshow that compared to the cement stabilizer,stabilizer developed in this project can significantly increase the strength of stabilized silt and sand mixture.The solidification mechanism is that the new stabilizers can produce more gel and expansive hydrated products,and the organic compounds in stabilizers can form organic molecules by polymerization process,which can wrap the particles of silt and sand resulting in the soil structure being compacted.