We compared some experimental methods to extract caffeine from tea.we say it useful method that make tea into the special tea dust.use it to extract caffeine by sublimation.

• 比较了几种从茶叶中提取咖啡因的实验方法；认为以茶末制成“茶砂”；用“茶砂”升华提取咖啡因的方法是一种较为可行的提取方法.