The volatile oil was extracted by steam distillation from different part of the fresh wild Houttuynia cordata.The antibacterial activity of the volatile oil was tested by agar diffusion assay,and the inhibitory effect on the proliferation of influenza virus was analyzed by blood coagulation test.The result shows that the whole plant of H.cordata has an antibacterial effect,and the extract from underground stem has the strongest inhibition on Staphylococlus aureus,Escheichia coli and Saccarom ycescerevisiae;the extract from leaves has the strongest inhibition on Shigella dysenteroae.The volatile oil from different part of the H.cordata has an inhibitory effect on the influenza virus.