The main factors for the deposition of nebulized inhaled drugs in the lungs are the inhalation method, the diameter of inhaled particles, lung capacity, inhalation airflow. 1. Inhalation method, nebulized inhalation drugs are generally first through the oral cavity, and then into the respiratory tract, always need to maintain the expiratory and inspiratory airflow, can not be inhaled through the nasal cavity, the nasal cavity for the filtering of particles with a large diameter, which reduces the amount of drugs into the respiratory tract. 2. Inhaled particle diameter, inhaled drug particle diameter also affects the deposition of drugs in the lungs, the diameter (airflow dynamics diameter) of the same particles naturally sinking speed and airflow dynamics, but the particle diameter and the therapeutic effect is not always proportional. 3. Lung capacity, lung capacity affects the amount of drug inhaled into the lungs, after inhalation still need to maintain a deep inhalation state for about 10 seconds, so the lung capacity is better inhaled into the lungs of the amount of drug is also relatively more, the therapeutic effect is better. 4. Inhalation position, inhalation of drugs, the head needs to be tilted back, so that the oral cavity and trachea is a larger angle, the amount of drugs into the respiratory tract will relatively increase, better efficacy. The above factors are part of the factors affecting the deposition of nebulized inhalation drugs in the lungs, nebulization needs to be carried out under the guidance of a doctor.