Wet rales are seen in bronchopulmonary disorders, left heart failure due to various reasons, and pulmonary edema. Lung function test is one of the necessary tests for respiratory diseases, which is of great significance for early detection of lung and airway pathology, assessment of disease severity and prognosis, evaluation of the efficacy of drugs or other treatments, identification of the causes of dyspnea, diagnosis of the location of the lesion, evaluation of lung function to the endurance of surgery or labor intensity, and the monitoring of critically ill patients. Lung disease patients will initially appear pneumonia, if not timely treatment, there may be emphysema, or even the emergence of lung cancer, so, after we suspect that their lungs have problems, we must go to the hospital to do the relevant lung examination, to understand their own disease, the following to understand the lung disease check items are included what? 1, routine: to determine whether there is a lung infection, initially clarify which kind of infection, diagnose whether the patient has anemia, whether there is a combination of other blood diseases. 2, functional tests: to clarify the nature and extent of lung damage, to determine the causes and types of respiratory abnormalities, patients with chronic obstructive pulmonary disease regular testing to clarify the effect of the treatment period and the role of drugs, to make a correct judgment on the development of the disease. 3, lung X-ray: it is one of the basic examinations for lung diseases, generally used to exclude some lung diseases and confirm some lung diseases. 4.CT examination of lungs: to make qualitative judgment on the problems found in X-ray chest radiographs, and to find out the hidden pathogens not found in X-ray chest radiographs. 5.Blood gas analysis: to determine whether there is respiratory failure and what type of respiratory failure, to determine whether the patient has acid-base imbalance and the type of acid-base imbalance, and to help observe the severity of the disease. 6, sputum microscopy and sputum culture: because patients with chronic obstructive pulmonary disease are usually accompanied by coughing and sputum, after sputum examination, a number of screening for germs, bacteria, parasites, and can be examined for cancer cells. 7.Cardiography: After questioning and percussion, cardiography is more necessary. Some COPD patients will have pulmonary heart disease in the late stage, so they need to do cardiac examination, such as electrocardiogram or 24-hour dynamic electrocardiogram, cardiac ultrasound.