To improve the water stability of the swelling soil on the channel bank slope and the fracture resistance of the swelling soil under wetting-drying conditions，this study adopts the concentrated MB-148 CA soil stabilizer to modify the soil properties of the swelling soil. It examines the modification effect and mechanism of the MB-148 CA soil stabilizer from macroscopic，mesoscopic，and microscopic perspectives by testing the water stability of the soil and the unconfined compressive strength of the soil under wetting-drying cycle conditions and conducting scanning electron microscopy tests of the soil. The test results support the following conclusions：1）The modified soil has better water stability，and its unconfined compressive strength is significantly higher than that of the plain swelling soil. The soil stabilizer adopted effectively suppresses the strength degradation rate of the soil and the fracture propagation rate under the wetting-drying cycle conditions. 2）The dilution concentration for the soil stabilizer to modify the swelling soil should not be lower than 1:300（volume ratio）.