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Pt-diffused coatings were synthesized on Ni10Al alloy by electroplating a thin layer of Pt (1-5 μm) followed by a diffusion treatment in vacuum at 1000-1100 ℃.Effects of processing parameters (Pt thickness and vacuum diffusion temperature) on the microstructures and chemical composition of Pt-diffused coatings were investigated.Also,the oxidation behavior of the coatings was studied at 1 100℃.Pt film reveals nano-sized grain size of 93-113 nm.Vacuum diffusion treatment leads to the grain growth.1-μm Pt film with 1000 ℃/1 h vacuum diffusion fabricates nano-sized Pt-diffused coating which exhibits the best oxidation resistance.And a single continuous Al2O3 scale forms on the coating with low Al (～ 9 at％) and Pt (～ 6 at％) contents.Increasing initial Pt thickness would introduce more defects and cracks,leading to a duplex scale and decreasing the oxidation resistance of Pt-diffused coatings.