Study of the feeding capacity of silver carp and bighead carp by means of experimental ecology showed that the fultering frequcecy of silver carp was slightly greatce than that of bighead carp. But that the latter’s suction volume was much greater than the former’s so the filtering rate (filtering frequency mul-tiplied by the suction volume) of silver carp was smaller than that of bighead carp. The removal rates of silver carp for phytoplankton were greater than those of bighead carp, hut of zooplankton the former were smaller than the latter. For food particles about 70um both removal rates were almost equal. The feedingling habits of the two species in natural waters is also dicussed in the paper.