Abstract: 【Objective】 Based on its abundant micro-pore structure, specific surface area and aromatic functional group, Biochar can effectively increase the stability of soil organic carbon and improve soil quality. 【Methods】 In this study, no exogenous carbon input was used as control (CK), the effects of different exogenous carbon input (straw 1%-Str1.0, straw 3%-Str3.0, straw10%-Str10.0, bio-carbon 0.8%-BC0.8, bio-carbon 2.4%-BC2.42, bio-carbon 8.0%-BC8.0) on soil water content, soil organic carbon content, maize chlorophyll content, net photosynthetic rate and yield were studied. 【Results】 The results showed that compared with CK treatment, biochar input significantly increased the soil moisture content at the stage of leaf-pulling, jointing, flowering and ripening of maize by 0.38%-3.64%,1.57%-15.57%, 0.37%-3.88%, respectively (P<0.05) ; After biochar input, soil organic carbon increased by 72.21%-99.45% in different growth stages of maize, while straw input increased soil organic carbon by 30.78%-41.38% in different growth stages of maize and the effects of biochar on the chlorophyll content (SPAD) of maize were increased by 13.33% and 0.07% at flowering stage and maturity stage, respectively.Compared with CK treatment, the net photosynthetic rate of maize at different growth stages increased by 15.99%-29.11% under biochar input, and the biggest increase was at flowering stage.Compared with CK treatment, corn yield was increased by 15.71% and 18.80% under the condition of biochar (BC0.8 and BC2.4). 【Conclusion】 The biochar BC0.8 and Str10.0 could effectively fertilize soil, promote corn growth and increase yield.