The production of swine manure has increased constantly with the development of livestock industry,swine manure contains a large amount of bacteria and pathogens,which can cause environmental pollution while being released without proper treatment.However,it may be utilized as a renewable feedstock to produce biocrude oil through hydrothermal liquefaction(HTL).This study investigated the effects of the operational parameters,including the temperature(220-370℃),the retention time(0-90 min)and the total solid content(TS)(10,20,30%)on the HTL of swine manure.The highest biocrude oil yield was 25.58%(based on the dry mass of the feedstock)at 340℃,a retention time of 30 min,a TS of 20%.GC-MS analysis indicated that the biocrude oil mainly consisted of esters,acids,aldehydes and hydrocarbon compounds.