By adopting the self-developed bulk material thermo-gravimetric analysis device

the pyrolysis behavior of biomass(stalks) under uniform temperature condition of 800 ℃

900 ℃

and 1000 ℃ has been studied.Results show that the reaction time of bulk material pyrolysis is short

the reaction in each stage is mutually piled up

and many peak values appeared on the curve of thermo-gravimetric analysis.By using the method of chemical dynamics

the single equation macroscopic model between mass loss and time in uniform temperature pyrolysis process has been fitted

obtaining the activation Energy E and the forward-indicating factor A

as well as the dynamics' equation of pyrolysis reaction under uniform temperature.The theoretical curve between mass-loss and time obtained from calculation tallies well with the curve obtained from test.