Objective: To optimize extraction process of total tannins in Diascoreo cirrhosa. Method: With content and transfer rate of total tannin as indexes

which was detenninated by UV.Single factor tests were adopted to screen extracting method

grinding degree

wetting time and other factors

effects of ethanol concentration

percolation velocity

collected liquid of percolate on extracting technology was investigated by L9(34) orthogonal test. Result: Ethanol percolation method was adopted

its optimum extraction process was as follows:soaked 24 h before percolation

grinding degree of herbs with coarse powder

wetting time 2 h

ethanol concentration of 80%

percolation velocity of 4 mL·kg-1·min-1

collected 8 times the amount of percolation solution. Conclusion: Optimized extraction process was stable and practicable

which was suitable for industrial production of D. cirrhosa tablets.