5,7-Dihydroxy-flavanone was synthesized with cinnamic acid from benzaldehyde, whose yield amounted to 91%. Its structure was characterized and confirmed by IR, MS and ^1H NMR. Meanwhile, bactericidal tests have been carried out, and the results of preliminary biological test indicated that the compound has excellent bactericidal activities against Escherichia coli, Bacillus subtilis, staphylococcus aureus. The inhibition rate againsted Escherichia coli, B...