2'-Hydroxy-3,4-dimethoxychalcone, a chalcone compound isolated from the roots of Sophora japonica, has antioxidant activity and inhibited the intracellular survival of Lactobacillus donovani Parasite EC.50 Values ranged between 0.39 and 0.41 μg/mL, which can be used in the study of diabetes, treatment of schistosomiasis, malaria and other infections.