The elemental analyzer is a scientific way to detect the radiant energy from the specific elements. According to the target, it can be divided into atomic spectroscopy and molecular spectroscopy. Atomic spectroscopy detects the spectra from the changes of energy changes in outer shells or inner shells. The related spectroscopy methods include, Atomic Emission Spectroscopy (AES), Atomic Absorption Spectroscopy (AAS), Atomic Fluorescence Spectrometry (AFS) and X-ray Fluorescence Spectroscopy (XFS). These spectra method has its application in the field of expertise. Such as XFS, is the main EU RoHS specifications for detecting harmful substances in the instrument.