Abstract: This study combined with the cement-soil mixing method,the X-ray diffraction(XRD) analysis of the undisturbed soil and the treated cement-soil microstructure in a shipbuilding reclamation site is performed to describe and analyze different conditions from a microscopic perspective.Including undisturbed soil,soil,depth,types of solidified materials,etc.Cement-soil mixing method is used to reinforce the deep foundation of the site,and the suggestions improving the strength of the cement-soil mixing pile are specifically proposed to guide the optimization and improvement of the actual project.