A total of 546 Carassius auratus gibelio were collected from the lower reaches of the main stream of Irtysh River in China from April to October,2013. The food composition,feeding intensity and spatiotemporal variation,and feeding strategy of C. auratus gibelio were systematically analyzed and studied. The statistical results indicated that the overall jejunum rate of C. auratus gibelio was 28.17%,and the rates of jejunum before breeding season (May,54.7%) were significantly higher than those in other months. For food occurrence rate,Bacillariophyta (100%),and Chironomus larvae (86.67%) were common in the food composition of C. auratus gibelio. The weight percentage (61.52%),dominance index (62.36%),and Amundsen figure indicated that the plant debris were the most important prey of C. auratus gibelio. In addition,the food composition of C. auratus gibelio showed significant differences amomg different seasons (P＜0.05),whereas showed no significant difference among different length groups (P＞0.05). These results showed that C. auratus gibelio in Irtysh River is omnivorous and partial to phytophagy.