This experiment was conducted to study the effects of different dietary Alkyl Polyglycoside (APG) levels on ruminal fermentation characteristic in order to observe the potential use value of APG in feed additive area. Four black goats with an average body weight of (19.5±0.8) kg were fitted with a ruminal cannula according to a 4×4 Latin square design. Diets based on experimental diet with four APG levels (0, 5, 10, 20 mL/kg) were formulated. The trial lasted for 48 days. The results showed that APG had no effect on rumen pH (P>0.05); the ruminal concentrations of ammonia nitrogen, total VFA, acetic acid concentration and the ratio of acetic acid and propionic acid content were increased significantly by added APG levels (P＜0.01), concentration of valerianic acid and molar percentage of acetic acid were also increased significantly (P＜0.05); however, there were no significant differences in rumen propionate acid, butyrate acid, isobutyric acid, isopentoic acid and other acids concentration by added APG levels (P>0.05) except acetic acid. It was concluded that adding different levels of APG had no effects on the rumen pH, and the concentrations of ammonia nitrogen was increased significantly, and the total VFA, acetic acid concentration and ruminal fermentation characteristic were improved in goats.［Chinese Journal of Animal Nutrition, 2009，21(6):872-877］