Purification engineering industry is an evergreen industry serving high-tech, national economy and people's livelihood. The development of science and technology and the improvement of residents' daily life quality all depend on the development of purification technology as its backstage support. The main components of the purification project have six parts, respectively: ground system, air duct system, automatic control system, electrical system, water supply and drainage system, air filtration system six parts. The following purification parameters should be known for the purification project plan: 1. Compartment, ceiling material, ceiling height; 2. Floor material; 3. Whether constant temperature and humidity; 4. Whether the need to exhaust air; 5. The total number of people in the workshop; 6. The heat of workshop process equipment.   Reduce the frequency of clean room ventilation: The number of ventilation in the purification workshop of the pharmaceutical factory is also closely related to the production process, the advanced degree of equipment and the layout, the size and shape of the workshop, and the density of personnel. When designing the purification workshop, attention should be paid to the construction area of the purification workshop, the reasonable layout of the production process of the purification workshop, and the daily management of the purification workshop of the pharmaceutical factory. It can reduce the frequency of ventilation to a certain extent.