Experiment was conducted to investigate the effects of the range of temperature fluctuation from -2.5℃ to 2.5℃.at 30℃and 35℃, respectively, on the VFA productivity and VFA main ingredients in the process of high concentration two-phase anaerobic digestion. A self-manufactured anaerobic hydrolytic and acidogenic system was used to process the raw material of fresh cow manure in this research. A difference was found that the effect of the temperature fluctuation on the VFA productivity at different based temp...