Methods: Rhizoma Coptidis, Cortex Phellodendri and Radix Sophorae Flavescentis in Sihuang Sanzi Decoction were identified by TLC.Results:The three species were positive in TLC identification.

• 方法:采用薄层色谱法对四黄三子汤中黄连、黄柏、苦参进行定性鉴别。