Adsorption behavior of a molecule on metal surface has been interested in a catalytic and surface reaction fields. In this study, we have studied an adsorption structure of the (CH@sub 3@)@sub 2@S on Cu(100) surface by use of polarization dependent S K-edge Near Edge X-ray Absorption Fine Structure (NEXAFS) and S 1s X-ray Photoelectron Spectroscopy (XPS) techniques. The Cu(100) crystal was cleaned by means of the Ar@super +@ bombardment and annealing up to 800 K. The cleanliness and order of the surface were verified by XPS and LEED. Research grade (CH@sub 3@)@sub 2@S molecule was introduced with an exposure of 0.4 L to the Cu(100) at 90 K, in order to obtain a submonolayer phase. S K-edge NEXAFS and XPS measurements were carried out at the soft X-ray double crystal monochromator beamline BL-3 on Hiroshima Synchrotron Radiation Center. By comparing the edge-jump ratio between the submonolayer phase and the S atomic adsorption phase, the S amount was estimated to be 0.2 ML. Noticeable polarization dependence can be seen in the NEXAFS spectra, first feature (1s-@sigma@@super *@(S-C)) is enhanced at normal incidence (electric vector is parallel to the surface). This result imply that the (CH@sub 3@)@sub 2@S molecule is lying on the Cu(100) surface without the cleavage of the S-C bonds. A significant chemical shifts of the S 1s XPS peak were observed to a lower binding energy side in the submonolayer phase compared to that of the multilayer. It found that the charge transfer occurs from the substrate to the S atom of the molecule.