This article is an excerpt from Meng Xiangchun, Huang Zepeng, Bi Fangcheng, Jin Wenyuan's "Dry Fog Humidity Control System Establishment and Application Test of Fruit and Vegetable Storage and Fresh-keeping", mainly presenting the use of Air Compressor (Air Compressor) in the author's experiment. In order to achieve precise automatic control of constant high humidity in the environment required for fruit and vegetable storage, the author used purified water and compressed air as raw materials, and used special atomizers humidity sensors, and microcomputer control terminals to design and build a dry fog humidity control system. The system can emit 2-10 μm water mist ions and evenly diffuse into the ambient air, providing precise high humidity of 90%-98%.