Objective: To investigate effects of different boiling conditions on quality of Buyang Huanwu decoction by double decocting non-pressurized machine. Method: A single factor test was adopted to investigate levels of adding water

with the contents of total solids

ferulic acid and astragaloside as comprehensive evaluation index

effects of soaking time

the amount of water

boiling times and time on technology were investigated by orthogonal test.The contents of ferulic acid and astragaloside were determined by HPLC. Result: Analysis of variance showed that effect of factors on boiling technology was in order of decoction times>the amount of water>decoction time>soaking time

only decoction times had significant impact.Optimum non-pressurized boiling technology was as following:soaked 30 min with 8-10 times the amount of water

decoction for 2 times

60 min per time. Conclusion: Optimized technology was stable and feasible

it provided theoretical basis for ferulic acid and astragaloside as main ingredients in traditional Chinese medicine decoctions.