Regarding wharf dike improved by wall-type deep cement mixing(DCM),there are significant differences between design methods in Chinese and American codes,yet existing research lacks comprehensive comparisons.On the basis of this issue,a comparative analysis is conducted using engineering case.The results show that the in-situ shear strength of cement-treated soil under American code is 34.8% higher than that under Chinese code.For DCM composite soil with a 50% replacement ratio,the American standard accounts for the influence of the site variability coefficient,resulting in shear strengths that are 22.6% higher than Chinese code when calculating circular slip stability,and 46.8% higher for other failure modes.When applying Chinese code to calculate DCM stability and strength,additional consideration of the vertical shear force from the soil on the active earth pressure side and the horizontal confining pressure at the toe can increase the anti-overturning stability factor by 5.7%,reduce the toe compressive stress by 7.8%,and increase the toe compressive strength by 29.6%.In Chinese code,the method of taking the vertical resultant force at the toe for wall-type DCM foundation bearing capacity calculation is unreasonable.The allowable vertical stress at the toe should be adopted,considering appropriate resistance partial factors.When calculating the vertical shear stress in the DCM body,the influence of eccentricity in the vertical resultant force at the base should be considered.In designing longitudinal walls to prevent soil extrusion between walls,refined specifications can be provided.