Abstract: The reinforced cement-soil mixing wall is composed of cement-soil piles connecting each other and shape steel. The moment induced by soil and water pressure is carried mostly by the shape steel. The cement-soil has contributed to carrying capacity of the shape steel. By analyzing the overall stability of the shape steel and mechanical status of cement-soil the effect of restriction of cement-soil on unitary stable capacity of the shape steel is studied. The principle about how to use the strength of cement-soil is proposed. The influence of constructing error on bearing force of the shape steel is analyzed. The technical measures in the design and construction of reinforced cement-soil mixing wall are proposed.