An improved anti-overturning safety factor calculation method of the cement-soil retaining wall in layered soil is presented. Based on the improved method

the influence of different soil structures on the anti-overturning safety factor is analyzed. When the soft soil is over the hard soil the anti-overturning safety factor increases with increasing of the width and the embedded depth of the wall respectively. Similarly the anti-overturning safety factor also increases with increasing of the width of the wall but has less change with increasing of the embedded depth of the wall when the hard soil is over the soft soil. The reason for that is the anti-overturning safety of the cement-soil retaining wall relies mainly on the passive earth pressure; that is to say

the anti-overturning safety factor is influenced by the lower soil’s strength mainly. If treating the layered soil parameters according to the thickness weighted as the homogeneous soil

the anti-overturning safety factor is smaller which inclines to conservative when the soft soil is over the hard soil. Unlike that the anti-overturning safety factor is bigger which has the security risk when the hard soil is over the soft soil. Compared with the conventional calculation method

the improved method presents a more reasonable and safe result.