Objective: To optimize extraction technology of total tannin from walnut green husk. Method: The content of total tannin was determined by phosphomolybdotungsitc acid UV spectrophotometry method.With the content of total tannin as index

single factor test was used to investigate extraction method and solvent;Extraction times

extraction time and solid-liquid ratio were chosen as factors

extracting technology of total tannin from walnut green husk was optimized by L9(34) orthogonal design test. Result: Optimum extracting technology was as following:extracted 3 times with 10 the amount of water

1 h each time

extracting rate of total tannin was up to 26.65 mg· g-1. Conclusion: Established a method of determination of total tannin was stable and feasible

optimized process could be used for industrial production of total tannin from walnut green husk.