The traditional calculation method of local safety factor is usually based on some yield criterion

which is used to evaluate the local stability of the slope by judging whether the slope body undergo plastic yielding or not.In fact

the plastic yield area is usually much larger than the range of sliding surface

so it is conservative to take the plastic yield as the local stability evaluation index.For this reason

the whole slipforming property analysis of the slope is put forward

that is

the fixed point method is used to describe the possibility of forming the whole sliding surface with the points in the slope

and the index is defined as the whole sliding factor.In the meantime

the plastic yield level of each point in the slope is expressed by the shear plastic yield coefficient.The two factors are combined to evaluate the local stability of the slope.The results show that the local safety factor is related not only to the current stress state

but also to the possibility of forming the whole sliding surface

which can be expressed as the product of the shear plastic yield coefficient and the sliding factor.In this paper

we use the ACADs referenced slope example to verify the correctness of the calculation method

which provides a new idea for slope stability analysis.