It is a fundamental task for soil structure study to find a quantitative parameter that reflects structural damage under pressure. Based on the unidirectional compression and isotonic compression tests of soft clays from Huangshi

Zhangzhou and Qingdao

the compression properties of structure soil and the effect of different conditions on the properties were investigated. It is found that when the pressure is lower than structure yield stress

it is mainly the initial structure selfalignment procedure and the structure is in few damage and the compressibility is small. When the pressure is bigger than the structure yield pressure

the structure destroys massively and the compressibility increases greatly not only from intergranular slipping but also from the collapse. With the damage properties in compression

a new coefficient was proposed to evaluate the structural behavior. And this parameter can be obtained simply through the software AutoCAD. With the proposed method

it is found that the soft clay in Qingdao is strongest in structural behavior

followed with that in Huangshi and Zhangzhou.