Abstract: Mass spectrometers are highly sophisticated instruments, most of which are imported from abroad. Our center (National Demonstration Center for Experimental Chemistry Education at the University of Science and Technology of China) had purchased the EXS800 teaching mass spectrometer in 2022 and introduced it into undergraduate instrumental analysis laboratory. Through disassembling or assembling of the teaching mass spectrometer by themselves, students’ understanding about the internal structure of the mass spectrum had been deepened. At the same time, it can also reduce students’ awe for large instruments, stimulate their curiosity, and enhance their practical ability and innovative consciousness.

Key words: Teaching mass spectrometer, Instrumental analysis laboratory, Autonomous instrument construction