Abstract: Effective components of chinese traditional herbs consist of many compounds,but some of the compounds usually contain unsaturated carbon--carbon doublebonds. The unsaturated organic compounds ~3H--Ferulic acid and ~3H--Caffeic acidare prepared with their tritiated intermediates can be made by electric--dischangeexposure method, which ensures the compounds contaning double bonds do notbecome hydrogenated. ~3H--Ferulic acid is composed of ~3H--vanillin and Malonicacid, ~3H Caffeic acid is composed of ~3H--protocatechuyl aldehyde and Malonicacid. Specific activity of the products 0.2 mCi/mg. Radiochemicaly purity 90%.