We commonly use a modified version of the British respiratory questionnaire, also called the mMRC score, which is actually divided into five levels: level 0, level I, level II, level III, and level IV. 1. level 0 is when there is dyspnea only during strenuous activity; 2. level I is when there is shortness of breath and dyspnea when walking fast on a flat surface or climbing a slope; 3. level II is when the patient is walking more slowly than his peers because of shortness of breath, or when he needs to stop and rest during walking; 4. level III is when the patient needs to stop and rest when walking 100 meters on a flat surface; 5. The need to stop and rest in the process of walking; 4. Grade III is when the patient needs to stop and rest when walking a hundred meters on flat ground; 5. Grade IV is when the patient has difficulty leaving the house or in putting on and taking off clothes because of severe dyspnea, such a small daily action will incur dyspnea. Respiratory distress is usually classified into five levels according to such a standard, 0, Ⅰ, Ⅱ, Ⅲ, Ⅳ. From this grading status, the higher the grade, the more severe the dyspnea is, and the more severe the patient’s condition is. Therefore, when judging their disease, patients with chronic obstructive pulmonary disease can also do such a questionnaire score. It is relatively simple, the more severe the symptoms the higher the score, which is an assessment of the disease and also an assessment of the prognosis, so when there is severe dyspnea, seek a doctor.