email: liuwg@cug.edu.cn or wengui.liu@thermofisher.com. Interests and research direction: R & D, application, maintenance and upgrading of isotope mass spectrometers and their peripherals. I worked in the isotope lab of Yichang Institute of Geology and mineral resources from 1986 to 2006 and was promoted to research fellow of precision instruments in 2002. As a professor, I have worked in the State Key Laboratory of geological process and mineral resources of China University of Geosciences (Wuhan) since 2006. Instruments I am quite good at: MAT250~MAT253，MAT260~MAT262, MAT281, MAT95, Argus VI, Delta series, Triton series, Neptune series, Element series, etc. Devices developed or modified: TIMS degassing device, data acquisition board, High voltage unit, filament current controller and regulator, RF generator, field regulator, motor controller, Turbo pump Controller, ion pump and ion pump controller, focusing unit, carbonate device, TIMS ion source, EI source, ICP Source, GC, EA, gasbench, precon, carbonate device, dual Inlet, Pericon, ion beam collectors(Faraday cup, SEM, CDD, etc).