When bronchiectasis is early, mild and limited in scope, lung function will not be affected too much, and it is possible to run at that time, and it is recommended to run every day in the outside environment with good air, which is very beneficial to bronchiectasis. Because the early lesions of bronchial dilatation are relatively limited and small, but due to the inflammation around the bronchial tubes caused by the expansion, it is a kind of sclerotic lesions, than the normal lung elasticity will be poor, so in normal circumstances, it is difficult to squeeze out the phlegm there. However, when the airflow is accelerated and the lung activity is relatively large during exercise, when the breathing volume is large and the lung contraction and diastole amplitude is relatively large, more squeezing of the lesion is properly carried out, which can help the phlegm to be discharged as much as possible. In addition, running itself is also good for improving the immunity of the body, and it can improve lung function, both of which can prevent further expansion of bronchial dilatation and can help it from repeated infections. Because the dirtier the lungs are, the more the lungs will be re-infected, and then the phlegm will be continuously expelled, and when the dirty things are expelled and the inside is clean, the infection will be less easy and the bronchial dilatation will not develop so fast.