At present, it is usually diagnosed that the cunkou pulse, that is, the artery on the thumb side of the wrist, belongs to the lung meridian of the hand Taiyin. Cunkou pulse has three parts: "Cunguan pool". The radial process is "Guan", with Cun before Guan (wrist end) and Ruler after Guan (elbow end), which are called Cun pulse, Guan pulse and Ruler pulse respectively. Pulse diagnosis uses three fingers: food, middle and nameless. Usually the middle finger is pressed near, the index finger is pressed on the inch, and the ring finger is pressed on the ruler. Pulse for tall people, with three fingers slightly apart, and pulse for short people, with three fingers properly close together.