The rheological properties of cellulose solutions in NMMO were investigated in terms of level of hydrated water in NMMO, polymer concentration, molecular weight, and temperature. In the case of 12 wt.% cellulose solutions, the lower Newtonian flow region disappeared at higher temperature as the hydrated water level was decreased. With 15 wt.% cellulose solutions, the lower Newtonian flow region was not observed over the examined range of shear rates and temperatures. At the identical concentration, viscosity was generally increased with decreasing the hydrated water level. However, the cellulose solution of Rayonex-P with high weight-average degree of polymerization 940 showed lower viscosity at lower hydrated water level at 90℃. In addition, an abrupt decrease of power-law index was observed at this temperature. With increasing the hydrated water level the effect of temperature on first normal stress difference and elongational viscosity was more notable.