[Objective] The purpose was to provide theoretical reference of application of natural pigment in the root of Phellodendron. [Method] Extraction conditions and stability of natural yellow pigment in the root of Phellodendron by microwave extraction were studied. [Result] The optimum conditions for microwave extracting were:the distilled water as extractant,radio of material to extractant 1∶100,microwave power 520 W and microwave irradiation time 160 s. The study results of stability of pigment showed that t...