This experiment was conducted to evaluate the metabolizable energy (ME) of corn germ meal (CGM) and corn distillers dried grains with solubles (DDGS) in Cherry Valley male meat ducks, and further to establish the prediction equations for their ME based on common nutritional component contents. The common nutritional component contents and gross energy (GE) of 6 kinds of CGM samples and 7 kinds of corn DDGS samples collected from different sources in China were determined, and their ME were evaluated by true metabolizable energy (TME) method. A total of 140 Cherry Valley male meat ducks[body weight:(3.3±0.3) kg] were randomly allotted into 14 groups (n=10), and one group was allocated as the endogenous losses group. Meat ducks in the 13 experimental groups were force-fed with a weight (2% body weight) of CGM or corn DDGS, and the endogenous losses group was kept in fasting with no force feeding. After 48 h of fasting, all excretion of each duck was collected for 48 h after force feeding. The results showed that the variations of crude protein (CP), ash (Ash) and ether extract (EE) contents of CGM were relatively large, and the coefficients of variation (CV) of them were 14.0%, 38.8% and 29.4%, respectively; the variations of Ash, EE and crude fibre (CF) contents of corn DDGS were relatively large, and the CV of them were 22.0%, 62.5% and 25.6%, respectively. The mean apparent metabolizable energy (AME), nitrogen-corrected AME (AMEn), TME and nitrogen-corrected TME (TMEn) of CGM were 7.87 (CV:26.6%), 7.93 (CV:24.3%), 9.36 (CV:22.1%) and 8.80 MJ/kg (CV:22.4%) as well as of corn DDGS were 10.79 (CV:11.4%), 10.87 (CV:12.3%), 12.89 (CV:9.7%) and 12.03 MJ/kg (CV:11.3%), respectively. The best TMEn prediction equation of CGM was TMEn=-1.179 CF+21.410 (R²=0.761 4, P=0.023 3), and of corn DDGS was TMEn=0.191 EE-0.542 CF+15.270 (R²=0.921 3, P=0.022 1). In conclusion, the differences of common nutritional component contents of corn germ meal and corn DDGS are relatively larger among different sources. The prediction equations of TMEn of corn germ meal and corn DDGS for meat ducks are established by analyzing the relationship between the TMEn and common nutritional component contents in this experiment which can provide technique support for the accurate and highly efficient utility of corn processing by-product in the diet of meat ducks.