Abstract: A field plot experiment was conducted to study the effect of biochar on vegetable yields and the soil physical and chemical properties in greenhouse.The results showed that biochar significantly reduced soil bulk density from 2.65% to 15.73%,improved soil CEC from 1.03% to 5.46%,increased soil organic carbon from 7.28% to 24.95%,and increased soil avaiable potassium from 19.07 %to 168.5%,compared with general treatment.The contents of soil hydrolysis nitrogen and available phosphorus were also increased,but the differences were not significant.Biochar had little effect on soil pH, but significantly increased soil total salt content.The low amount of biochar had little effect on vegetable yields or improved the yields, but with increasing usage, the yields tent to downward. Therefore, the application amount of biochar should not be too high in greenhouse soil.