Theasaponin was prepared by sedimentation in this paper. The result showed that the best deposit conditions were as follows: room temperature, 3 h and 16% of CaO. Decompounding solution was filtrated under vacuum and the filter cake was washed with hot water. For decompounding the theasaponin, the best reagent, reaction temperature and time were NH4HCO3, 70 ℃, and 2.5 h, respectively. This method could reduce energy consumption as well as the production cost.
