AIM To study the effects of processing on nine active constituents originated from the different processed products of Aurantii Fructus. METHODS RP-HPLC was used to assay the active constituents,including narigin,hesperidin,neohesperidin,meranzin hydrate,meranzin,marmin,nobiletin,tangeretin and auraptene from A. Fructus. RESULTS Compared with the traditional production,the processing of A. Fructus by pharmacopoeia-style,Zhang( shu)-style and and Jianchang-style stir-baking,made its active constituents the significant changes. CONCLUSION To process A. Fructus by stir-baking with wheat-bran or wheat- bran-honey,their flavonoid glycosides increase,and fat-soluble components reduce. Zhang( shu)-style fermenation makes flavonoid glycosides of A. Fructus go down,and fat-soluble components go up.