[Objective] This paper aimed to study the effect of temperature on gas production volume and period of biogas fermentation.[Method] The fresh pig manure were as materials,and the effect of temperature (6 ℃,12 ℃,18 ℃,24 ℃,30 ℃) on fermentation start-up and period of biogas production were studied for 180 days of anaerobic fermentation.[Result] The results showed that fermentation could be started in all temperature levels,the higher the temperature,the more biogas production,and the fermented period reduced with the temperature going up.The period was 7 months at low temperature (below 20 ℃),4 months at middle temperature (20-45 ℃).The aniseed was changed twice a year in February to March and July to August,which took 20-30 days.It had the best biogas production period in 24 ℃ when the biogas production volume was high and stable.[Conclusion] The best temperature for pig manure fermentation was 24 ℃. [Objective] This paper aimed to study the effect of temperature on gas production volume and period of biogas fermentation. [Method] The fresh pig manure were as materials, and the effect of temperature (6 ° C, 12 ° C, 18 ° C, 24 ° C , 30 ° C) on fermentation start-up and period of biogas production were studied for 180 days of anaerobic fermentation. [Result] The results showed that fermentation could be started in all temperature levels, the higher the temperature, the more biogas production, and the fermented period reduced with the temperature going up the period was 7 months at low temperature (below 20 ° C), 4 months at middle temperature (20-45 ° C) .The aniseed changed twice a year in February to March and July to August, which took 20-30 days. It had the best biogas production period in 24 ° C when the biogas production volume was high and stable. [Conclusion] The best temperature for pig manure fermentation was 24 ° C.