Abstract: The reology of mixture of Crotalaria mucronata bean bum and xanthan gum was studied by measuring the viscosity of the system. The results showed that there is a strong synergy of Crotalaria mucronata bean gum with xanthan gum,and the best mixture ratio is 6:4. The viscosity of the mixed gum increases with the increase of concentration,when the concentration is 0.4%,the gelatin begins forming,up to 0.8% concentration,firm gelatin forms,and the the viscosity at 0.7% concentration is 5367 mPa·s. The mixed gum is" non-Newtonian fluid",and the solution i"splastic-fluid". The best heating temperature is 80 ℃,and heating time is 1 h. pH 5 to 9,freezing-thawing,ultrasound and microwave have little effects on the mixed gum,which has better salt-tolerance.

Key words: Crotalaria mucronata bean bum, xanthan gum, mixed gum, rheology, synergistic