Whether or not the lungs are able to expel dust after inhalation depends mainly on the amount and time of inhalation. In the clinic, in general, the body’s lungs after inhaling dust, are able to through the alveoli and bronchial wall secretion of mucus, mixed and then constantly through the bronchial wall of the cilia, and constantly upward movement, and gradually will be discharged in the form of coughing out of the dust. If the dust is inhaled for a long time and the density of the dust is relatively large, part of the dust inhaled into the lungs can not be discharged from the body, and may be deposited in the lungs, forming pneumoconiosis or even silicosis, which requires appropriate treatment, and if necessary, alveolar lavage can be carried out as well as the use of anti-fibrotic drugs for lung tissue.