Abstract: Based on the consolidation tests of Shanghai clay in undisturbed and reconstituted state, the different compressibility of undisturbed soil and reconstituted soil, as well as coefficient of compressibility and modulus of compressibility are analyzed. The influence of soil structure on the compressibility of shanghai clay is investigated, and tiny behavior of soil is analyzed. The yielding structure strain of shanghai clay is obtained, which is between 100 to 150 kpa, and how it affect coefficient of compressibility and modulus of compressibility is also investigated.