In this paper,rape straws were activated with H_3PO_4,and biochars(PRS-BC) were pyrolyzed and prepared at high temperature with limited oxygen. The impacts of phosphoric acid concentrations and pyrolysis temperatures on the structure and properties of PRS-BC were investigated. Our main results indicated that with the increase of the temperature,when the rape straws were treated with the same concentration of phosphoric acid,the content of fatty group carbon decreased,the aromatic group matters gradually inc...