Abstract: The dispersive soil has the engineering characteristics of dispersivity and loss in water. It is often stabilized by lime, cement, etc. But these stabilized materials are easy to cause certain damage to the environment. Through the pinhole tests, the crumb tests, the double-hydrometer tests, the scanning electron microscope tests and the energy spectrum analysis tests, the influence factors and the mechanism of the stabilized dispersive soil with calcium bicarbonate formed by pseudo-karstification are studied. The test results show that the separation of soil and liquid by suction filtration or suction can ensure the high decomposition degree of calcium bicarbonate, the fast modification rate and the good modification effect. When the mass ratio of karst calcium bicarbonate solution to dispersible soil is 4:1, the dispersive soil is modified into the non-dispersive soil. After the calcium bicarbonate solution by pseudo-karstification is added to the dispersive soil, the content of calcium ions in the soil increases, and the alkalinity of the soil decreases. The newly-generated calcium carbonate has a filling and cementing effect to improve the water resistance of the soil and to reduce its dispersivity. It has shown that the calcium bicarbonate solution by pseudo-karstification has the characteristics of environmental friendliness and can effectively stabilize the dispersive soil.