Abstract: Abstract: In order to efficiently burning utilize the agricultural biomass and oil shale, the thermogravimetry experimentation of corn stalks and oil shale mixed fuels was performed by using the TG-DSC (thermogravimetric-differential scanning calorimetry) thermal analysis technology. All of its combustion characteristics and combustion mechanisms were investigated and calculated using combustion kinetics parameters. The results showed that the DTG (differential thermogravimetric) curves of co-combustion samples have four peaks, the semicellulose volatile pyrolysis of corn straw, cellulose volatiles pyrolysis, combustion and ignition coke of lignin pyrolysis and oil shale volatiles pyrolysis, combustion and ignition of coke oil shale pyrolysis, and a small amount of oil shale inorganic salt pyrolysis, respectively. Each DTG peak becomes more obvious with the increasing of the oil shale content. The DSC curves showed that the mixed burning period is the main heat release process, but with the increasing of the oil shale content, the DSC curves of endothermic peak of combustion late were more obvious. Between the first and third peak of DTG curves, the DSC (differential scanning calorimetry) curve appears as the exothermic peak. Between the third and fourth peak of DTG curves, the DSC curve appears as the endothermic peak. It is needed to strengthen the pre-combustion of mixed fuels. The index of combustible characteristics, ignition characteristics, and synthetic combustion characteristics of the corn stalk and oil shale mass ratio of 4:1 of mixed fuel S2 are all the largest. The burnout time of S2 is the shortest, and the burnout characteristics index of S2 is the second in the mixed sample values, which shows the excellent comprehensive combustion performance. At the low temperature stage of the first three temperature sections of mixed samples, the corn straw pyrolysis of hemicellulose, cellulose, and lignin in the mixed sample absorb more heat. At the same time, the oil shale volatile pyrolysis also needs to absorb heat to increase the reaction activity of samples molecular, accelerating the samples pyrolysis. Then it needs the higher activation energy at the low temperature stage. At the higher temperature stage of the first three temperature sections of mixed samples, it is mainly the combustion process of lignin pyrolysis coke, and it requires less heat so the activation energy is lower. At the previous three temperature sections, the mixed samples of activation energy and frequency factor were reduced with the increasing of the temperature zone, reflecting of the activation energy, and frequency factor change consistency. The reaction order at the low temperature and the high temperature phase is about 1.5 and 0.7, respectively. The study results can provide the reference for large-scale co-combustion and utilization of agricultural biomass and oil shale.