Weak pulse is due to the deficiency of yang qi and yin blood, the qi and blood are unable to spread outside and the pulse is sunken; the pulse is thin and weak due to the weakness of the filling and bulging. 1.Pulse rhythm examination. An auxiliary examination method used to check whether the pulse is normal. The rhythm of the normal pulse is regular. However, in normal children, young people and some adults can appear respiratory sinus arrhythmia, which is manifested as an increase in pulse rate during inspiration and a slowdown during expiration. All kinds of arrhythmias, such as too fast, too slow or irregular in the heart rhythm, can also be reflected in the pulse. This examination can determine the weak pulse lesion site and the corresponding signs. 2.Arterial auscultation examination. Weak pulse is one of the auxiliary examination methods. If vascular lesions are suspected, the carotid artery (inner edge of the sternocleidomastoid muscle, the height of the upper edge of the thyroid cartilage), the subclavian artery, the renal artery, the abdominal aorta, the brachial artery, the femoral artery, etc. can be selected for auscultation. Under normal conditions, only two heart sounds consistent with S1 and S2 can be heard in the carotid and supraclavicular arteries, which are called normal arterial sounds. Arterial murmurs are mostly found in the peripheral arteries, but also in the pulmonary and coronary arteries. 3.Pulse image. A graph of various pulse information traced by an instrument that simulates the method of pulse cutting in Chinese medicine. It is an important technical achievement in the modern research of pulse diagnosis, and is an important technical tool for the objectification and standardization of pulse diagnosis. The graph is an objective record of the pulse information measured. A typical normal pulse chart consists of a group of wave clusters and the intervals between the waves, representing a complete pulse beat cycle. 4.Other examination. In addition if necessary weak pulse also need to check the red blood cells, hemoglobin, red blood cell ratio, etc. to confirm the diagnosis, the most basic hematological examination should include reticulocyte count, corrected reticulocyte count = the patient’s red blood cell pressure / 0.45/L × reticulocyte (%). the MCV and MCHC determination. Peripheral blood smear to observe the presence of abnormal erythrocytes, such as spherical erythrocytes, target-shaped erythrocytes, lytic cells, uneven erythrocyte size, and abnormal cells. Routine urine, fecal occult blood and parasitic eggs, blood urea nitrogen, blood creatinine and lung X-ray should not be neglected.