The vacuum environment greatly reduces the boiling point of the liquid that needs to be driven off, so the vacuum drying can be easily applied to heat-sensitive substances; for the samples which are not easy to be dried, such as powder or other granular samples, the use of vacuum drying method can effectively shorten the drying time; all kinds of complex mechanical parts or other porous samples after cleaning the use of vacuum drying method, after complete drying does not leave any residue of substances; safer to use under vacuum or inert conditions. Substances; safer to use in a vacuum or inert conditions, completely eliminating the possibility of explosion of oxides in the event of heat; compared with ordinary drying relying on air circulation, powdered samples will not be blown by the flow of air or movement; control features: with a power outage, shutdown state of the loss of data and protection of the parameter memory, the incoming call to restore the function.