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Cellulose formate (CF) with surface formyl groups can be prepared through the esterification between cellulose and formic acid (FA). The properties of CF are sensitive to temperature, which is of great importance for its end application. In this work, the effect of four drying methods on the structure and properties of the resultant CF was investigated. Results showed that the CF samples as special cellulose nanofibrils with cellulose II crystal form and fibrous structure were sensitive to drying temperature and drying time. The freeze-d