Abstract: Platinum（Pt） and Carbon（C） was coated on the substrate of silicon and molybdenum by ion beam assisted deposition（IBAD）.The structure of the as-deposited Pt-C film was studied by XRD and Raman spectroscopy.The XRD results show that Pt exhibits mixed strong（111） and weak（200） orientations.The Raman spectrum show that the carbon exists in the form of amorphous.The electron emission suppression characteristics of Pt-C thin film were measured using analogous diode method.The results show that electron-emission from Mo anode coated with Pt-C film is much less than that from the Mo anode without Pt-C film.