Abstract: A series of undrained shear tests with different effective confining pressures were conducted to study the effect of the gas content on pore pressure variation and strain isolines of remolded fine aerated soil based on the microporous adsorption properties of zeolite. Before the axial strain reached 5%, the pore pressure of saturated soil developed faster than that of aerated fine-grained soil, while the axial strain exceeded 5%, the pore pressure of aerated soil developed faster than that of saturated soil. In the same strain, the pore pressure in aerated soil was larger and the corresponding shear strength was smaller. In different contents of gas, the slope of the critical state line was a constant, it was 1.25. The strain isolines along the effective stress paths of soil with different contents of gas under different confining pressures could be regarded as straight lines, and their slopes increased gradually with the increase of strains and finally coincided with the critical state lines.