The properties of SMBC(soil microbial biomass carbon), q_SMBC(biological information entropy) during revegetation on hillslope land with purple soils in Hengyang City of Hunan Province were studied using the space for time method. The results showed that:(1) SMBC and q_SMBC significantly increased from bare land(Ⅰ), herbaceous community(Ⅱ), shrubby community(Ⅲ) to arboreal community stage(Ⅳ);(2) SMBC significantly decreased but q_SMBC significantly increased from soil layer of 0-20 cm, 20-40 cm to 40-60 cm;(3) From stage Ⅱ,Ⅲ to Ⅳ, SMBC in R(rhizosphere) and S(non-rhizosphere) were significantly increased, and expressed the properties SMBC_R>SMBC_S, SMBC_R/SMBC_S in stage Ⅱ was obviously higher than that in Ⅲ and Ⅳ. q_SMBCR and q_SMBCS significantly increased from stage Ⅱ to Ⅳ, and q_SMBCR<q_SMBCS, but q_SMBCR/q_SMBCS had no significant difference;(4) Correlation analysis showed:SMBC and q_SMBC highly or significantly positively correlated with soil organic carbon and cation exchange capacity(CEC), and significantly negatively correlated with bulk density.