Abstract: In this work,the conditions（temperature and treatment time）of different wet heat pretreatment for oil removal are investigated using food waste as raw material and tested for biogas production potential as anaerobic digestion substrate. The results show that the optimal wet-based thermal oil removal pretreatment condition is 95 ℃,the treatment time is 90 min,the floating oil content of food waste is 4.22%,and the oil removal rate is 2.21%. The biogas yield of food waste anaerobic digestion after 95 ℃ wet-based thermal pretreatment is the largest,reaching 413 mL/gVS. The pH of the biogas slurry is kept at 6.5-7.5,and the conversion rate of volatile fatty acids reaches 74.31%,which is better than the other two pretreatment groups. The VS and TS removal rate of the effluent increased with the increase of treatment temperature. Under the condition of 95 ℃ pretreatment,the VS removal rate reaches 56.2%,which is 8.1%higher than that of the non-pretreatment.