Abstract: Solid-state benzyl malonic acid was synthesized in laboratory with its catchability studied preliminarily. Test results showed that the acid has highest catchability for galena in comparison with that for sphalerite and smithsonite, e.g., the recovery rate of galena is over 90% by use of a very small dose of the acid whose pH value is 4-10. Its catchability is efficient to a certain extent to sphalerite of which the recovery rate decreases gradually with increasing pH value, while basically it has no catchability for smithsonite. The main cause of such results is that the O-O chelation takes place between benzyl malonic acid and Pb on galena surface so as to form six-membered ring chelate with a co-absorption between galenite ions and molecule occurring at the same time, but on sphalerite surface only the molecule absorption occurs.