N-allylpyridinium chloride ionic liquid (［APy］Cl) was synthesized by one-step process and its property of dissolving cellulose was investigated.The results showed that the solubility of cotton linter pulp cellulose (degree of polymerization (DP)=556) was 19.71% at 120℃

and the thermostability of regenerated cellulose (DP=223) seriously decreased.The performance of regenerated cellulose could be enhanced by adding cosolvents into ［APy］Cl.Compared with other cosolvent (DMSO

DMF or pyridine)

the ［APy］Cl/DMAc composite solvent exhibited a better dissolution to cotton linter pulp cellulose.The solubility was 15.03% and the DP of regenerated cellulose was 403 at 100℃ with lower cost.But the solubility of ［APy］Cl/DMAc was only 1.36% at 70℃.So

the ［APy］Cl/1-N-ally1-3-methylimidazolium chloride ionic liquid (［AMIM］Cl) solvent was discussed afterwards.The results showed that the solubility of cotton linter pulp was 8.78% and the DP of regenerated cellulose was 516 in ［APy］Cl/［AMIM］Cl composite solvent at 70℃.Besides

［APy］Cl/DMAc and ［APy］Cl/［AMIM］Cl were liquid respectively below the melting point of ［APy］Cl and they were the potential cellulose solvent.The FTIR

XRD and TGA spectrograms showed that these solvents were non-derivatizing solvents for cellulose

the cellulose was changed from cellulose Ⅰ to cellulose Ⅱ during dissolution and regeneration and the thermal stability of the regenerated cellulose slightly decreased.The photographs and SEM image indicated that the regenerated cellulose membrane was homogeneous and dense.