Abstract: Hydrochars derived from garden waste were prepared by hydrothermal carbonization（HTC）for solid biofuel production. The effects of temperature and time on the fuel properties and combustion behaviors of hydrochars were investigated,and the combustion process and parameters of hydrochars were also simulated and drived through combustion kinetics analysis. The results showed that the fuel properties of obtained hydrochars were dramatically improved by preparing conditions modification,among which temperature played a critical role on fuel properties improvement. The high heating value of hydrochars was found to be ranging from 19.86 to 27.93MJ/kg,which reached a level comparable to that of industrial coal. With the increase of HTC temperature and the extension of the time,the combustion values of parameters T_i,T_f and T_m of hydrochars increased,meanwhile,the TG-DTG curves shifted towards the high temperature range,indicating that the thermal stability of the produced hydrochars were enhanced. The results of hydrochar combustion kinetics analysis showed that the combustion reaction process of hydrochars fitted well to the first-order combustion kinetics（R~2=0.93-0.99）,and the produced hydrochars had high reaction activation energy（17.33-41.34 kJ/mol）.