Tube dryer is a commonly used equipment in chemical laboratories for drying solid samples. It is usually made of heat-resistant glass tube, with one end closed and the other end open, and a desiccant such as silica gel or molecular sieve can be placed inside. The open end of the dryer is equipped with a grinding plug, which can be connected to a vacuum pump or nitrogen source to provide a dry inert gas environment during the drying process. In teaching, students can learn the drying principle and operation skills through a tubular dryer, understand the properties and applications of different desiccants, and it is an important tool in chemical experimental teaching.