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In this paper, electron beam physical vapor deposition technique was taken to prepare double structure thermal barrier coatings on Ni-based single crystal substrate. Then, a Nd: YAG laser was used to modify the surface of the as-deposited samples to obtain a thermal barrier coatings with a composite structure. The oxidation resistance and corrosion resistance of EB-PVD deposited as well as laser-modified coatings were investigated by isothermal oxidation treatment at 1100℃. The microstructure and phase composition of the coatings were characterized by scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The results revealed that the surface of the coating formed a dense layer after the laser modifing, which structure was together with the original columnar crystals YSZ layer, deposited by EB-PVD, to a composite ceramic coating. Consequently, the diffusion behavior of harmful element was slowed down by composite ceramic coating into the substrate, and the oxidation resistance and corrosion resistance of the samples were improved.