Oral inhalation preparations have unique advantages in the treatment of respiratory diseases such as asthma and COPD. However，the integration of such preparations with equipment has high barriers to innovation and imitation，and due to the medication habits of different countries and regions，the market patterns are different. In December 2020，the National Center for Drug Evaluation issued the “Guiding Principles for the Research on the Bioequivalence of Generic Drugs of Oral Inhalation Preparations”，which proposed the pharmaceutical and clinical requirements on dry power inhalers，inhaled aerosols and inhalation solutions，enabling China’s inhalation preparations to develop rapidly. This paper reviews the development of foreign and domestic inhalation preparation markets，analyzes the technical barriers existing in inhalation preparations，and predicts the future development trend and prospect of inhalation preparations in China，with a view to providing references for the development of domestic inhalation industry.