The experiment was conducted to study the effects of soybean oil and fish oil on fatty liver producing performance and quality of force-fed cherry valley ducks based on an equal dietary energy level. A single factor design was adopted. Sixty 8-week-old cherry valley ducks (similar body weight) were randomly divided into 3 treatments with 20 replicates per treatment and 1 duck per replicate. The experiment lasted for 21 d. The ducks were force-fed with corn diet from 1 to 7 days. From 8 to 21 days, the ducks in treatment 1 (corn group) were force-fed with corn diet without oil supplementation, and those in treatments 2 (soybean oil group) and 3 (fish oil group) were force-fed with the corn diet including 3% soybean oil and 3% fish oil, respectively. The ducks in all treatments had the equal energy intake. The results showed as follows: fatty liver producing performance was increased with the duration of force-feeding (P<0.01). In fish oil group, average fatty liver weight, ratio of feed intake to fatty liver weight and ratio of fatty liver weight to body weight were 301.89 g, 37.25 and 5.15, respectively, and were significantly higher than those in corn group and soybean oil group after 3 weeks of force-feeding (P<0.01). The content of ether extract of fatty liver in fish oil group was significantly higher than that in corn group and soybean oil group (P<0.01). The fatty liver slice indicated that the amount of fat drops was increased with duration of force-feeding, and fat drops of fatty liver in fish oil group were the most, the largest and fusional. The content of saturated fatty acid of fatty liver was significantly decreased, but the content of unsaturated fatty acid was significantly increased in soybean oil group and fish oil group (P<0.01), and especially fish oil increased the contents of eicosapentaenoic acid and docosahexaenoic acid in fatty liver （P<0.01）. Soybean oil increased the contents of linoleic acid and linolenic acid in fatty liver （P<0.01）. It can be concluded that on d 8 to 21 of force-feeding, fish oil supplementation will improve the fatty liver producing performance and quality of cherry valley duck based on an equal dietary energy level, and soybean oil supplementation has no significant effect on the fatty liver producing performance, but can improve fatty acid composition of fatty liver.［Chinese Journal of Animal Nutrition, 2010，22（6）:1558-1565］