The kinetic behavior and evolution characteristics of gaseous products during the combustion of biocrude oil from solvolysis liquefaction of Chlorella pyrenoidosa were investigated by thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR). The results indicated the biocrude oil obtained from different ethanol/water mixed ratio had obvious difference with each other. The ignition temperature of biocrude oil from ethanol-water co-solvent was lower than that from pure water solvent, which promoted the comprehensive combustion index. Especially, BO40 (biocrude oil obtained from 40% ethanol content) achieved the lowest ignition temperature (163.4 degrees C) and high comprehensive combustion index (1.24 x 10(-06) min(-2) degrees C-3). C-H, C=O, C=C, CO2, CO and HCN were the main gaseous products. Compared to other biocrude oil samples, BO40 had high first peak intensity of CAH, C=O and C=C, and low peak intensity of CO, which performed better combustion characteristic. (C) 2017 Elsevier Ltd. All rights reserved.