Abstract: In order to provide basic data for industrial scale-up of high value fuel prepared from pyrolysis bituminous coal in fixed bed reactor, the pyrolysis characteristics and kinetic parameters of bituminous coal from Shaanxi Hong Liulin in N2, CH4, CO2, H2 and CO2+CH4 mixture were studied in a thermogravimetric analyzer (TG) and thermogravimetric mass spectrometry analyzer (TG-MS). On this basis, thermogravimetric mass spectrometry analyzer (TG-MS) were used to investigate the release of gaseous products. The experimental results showed that the pyrolysis of coal sample can be divided into three stages. The first stage is temperature range from room temperature to 388 ℃; the second stage is 388 ~605℃; the third stage is 605 ~1000℃. The maximum release intensity in N2 and CO2+CH4 appeared at about 505℃. In carrier gas of H2, CH4 and CO2, the maximum release peak of CH4 passes to the high temperature, and the maximum release temperature of CH4 increases most in CO2. The reaction between coal sample and CO2 during gasification is more involved. Therefore, the pyrolysis process of coal can be described better by second-order reaction (n=2) and three-order reaction (n=3) in the second and third stages of pyrolysis reaction.