A novel solvent N-methylmorpholine-N-oxide (NMMO) is used in the Lyocell process of textile industry to physically dissolve cellulose.Chemical degradation of cellulose can be avoided so the natural characteristics of cellulose are satisfactorily preserved.A novel cellulose membrane was developed with NMMO as solvent.The prepared novel cellulose membrane has application potentials in such areas as acidic gases permeation and separation in water-swollen state; high and stable SO2 permeation performance after being added sulfoxide-containing group by chemical modification; excellent fouling resistance ability during water-oil separation because of its strong hydrophilicity.