Through the decompression, water bath heating and vortex oscillation, the solvent is evaporated rapidly and condensed in the serpentine condenser tube and refluxed into the collection bottle for solvent recovery. Because of its strong batch processing capacity, high concentration efficiency and green environmental protection, it is widely used in the fields of food safety, agricultural product testing, drug analysis, environmental monitoring, etc. Especially for the reliable detection and analysis of trace targets, the concentration method has significant advantages.