Objective To investigate the grading method and standard of pulmonary function of Lung Qi Deficiency Syndrome.Methods Firstly

the questionnaire investigation was carried out on 1163 patients with respiratory diseases

including chronic obstructive pulmonary diseases （COPD）

bronchial asthma

interstitial lung disease

upper respiratory tract infection

cough after cold

chronic bronchitis

bronchiectasis

allergic rhinitis

chronic pulmonary heart disease in remission

chronic laryngitis

sleep apnea syndrome

lung cancer

and pneumoconiosis.Secondly

317 of them

who were with Lung Qi Deficiency Syndrome

were graduated according to the pulmonary function examination.Finally

the graduation with symptom scores on every grade of pulmonary function was applied.The results of the pulmonary function graduate and the symptom score graduate were compared.Results Of the pulmonary function graduation

there were 131 patients in mild grade of Lung Qi Deficiency Syndrome

109 in medium grade

and 77 in severe grade.Of the symptom score grading

in the mild grade of Lung Qi Deficiency Syndrome

there were 123 patients in mild grade

8 in medium grade

and one in severe grade;In the medium grade of Lung Qi Deficiency Syndrome

there were 101 patients in medium grade

5 in mild grade

and 3 patients in severe grade;In the severe grade of Lung Qi Deficiency Syndrome

there were 70 patients in severe grade

7 in medium grade

and one in mild grade.The results of the two graduate methods showed no significant difference（P>0.05）.Conclusion The result of pulmonary function grading and symptom grading of Lung Qi Deficiency Syndrome was uniform

indicating that pulmonary fucntion grading may be as reference index for diagnosis of Lung Qi Deficiency Syndrome.