The collateral diagnosis method is unique in Traditional Chinese Medicine diagnosis methods which has important clinical value. In my article, the contents of the "Hwangjenaegyeong(黃帝內經)" related to this method is discussed. According to the site of inspection in the diagnosis process, there are five types as following: inspection of the face and surface, the thenar, the orifices, abdominal collaterals and finally the index finger of children. This method can inspire clinical practitioners.