Abstract: The hydrothermal carbonation experiments were carried out at 190-270 ℃ for 60 min by using reed stalk as a raw material,pure water and bean curd wastewater as solvent. The composition and fuel characteristics of hydrochar with two kinds of hydrothermal solvent were analyzed thoroughly. The results show that with the increasing of temperature,the yield of hydrochar decreases from 84.6%to 52.4% with the bean curd wastewater solvent. However,the yields are about 11%-17% higher than those obtained with the pure water solvent under the same condition. The carbon content of hydrochar increases from 51.51% to 69.41% with the bean curd wastewater solvent. Compared with the pure water solvent,the carbon content of hydrochar is higher while the O/C atom ratio is lower within the whole experimental temperature range. At 250 ℃,the higher heating value and energy densification of hydrochar is up to 27.6 MJ/kg and 1.72 respectively,and the fuel ratio is 0.92. Moreover,the atomic ratios of H/C and O/C enter the lignite area. The bean curd wastewater promotes the hydrothermal decarboxylation reaction of reed stalk and enhances the fuel properties of hydrochar.