Abstract: The effect of weight ratio, stirring time, temperature, p H, and deposited time on its viscosity property of CMC-KGM sol were investigated systematically through single factor and L9 (34) orthogonal tests. The results indicated there was a synergistic thickening effect between CMC and KGM. An excellent stability regarding the viscosity of the CMC-KGM sol was found with the extension of deposited time, comparing with KGM sol. The optimal conditions for the preparation of CMC-KGM sol were as follows :the mass ratio of CMC to KGM was2∶8 (the initial concentration of CMC-KGM sol was 10g/L) , stirring time 4h, temperature 30℃ and p H at 7, respectively. Besides, ultimately, it was up to the viscosity of 38063 m Pa·s with respect to synthetic system.