Developmental morphology of feeding organ of crucian carp (Cara-ssius carassius cuvisri) varying from 5.5mm to 260.0mm in total length (n430)was observed by gross anatomy, tissue sections,microscopy and scanning electronmicrocopy. Morphological and quatitative changes in mouth diameter, gill rakers,lateral protuberances and palatine folds were described during postembryonic de- velopment. The following aspects were discussed: (1) feeding mode and feedingfunction for crucian carp; (2) development of feeding organ and transition of fee-ding behavior; (3) relationship between changes in quantitative traits of feedingo gan and suitable size and composition of food; (4) development of feeding organand biological technique on culture of crucian carp.