[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 ℃.
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