Abstract: The stability of underground rock will be changed in the acid water for a long time, and it takes a serious threat to the safety of construction in the underground. Taking the white sandstone as the research object, the dynamic impact test was conducted by split hopkinson pressure bar（SHPB） experimental system, and the whole impact process was captured by a high-speed camera. The stress-strain curves and circumferential strains of the specimens under different conditions were obtained. The results show that the densification stage and the linear elastic stage are not obvious in each stress-strain curve and the plastic platform stage is formed before and after the stress peak. The order of stress peak of specimens under various working conditions is σ_H7-0＞σ_H4-10＞σ_H4-20＞σ_H2-10＞σ_H2-20. Under uniaxial compression, the rock elements are damaged by tension. And the more acidic the solution is, and the longer the soaking time is, the lower the circumferential strain peak is. The failure model of sandstone is split failure with radial expansion, and the degree of failure is correlated with solution acidity and soaking time positively.