Carbon deposition is one of the major issues for catalytic methanation,especially when using high CO content syngas (such as H2/CO =1) due to the inevitable Boudouard reaction.Here we report the significant enhancement on the coke-resistance of Ni/MgAl2O4 catalyst during methanation by modifying with Au.The coke-resistant property was increased with Au addition while the catalytic activity decreased with excess Au.High and stable syngas conversions can be obtained over Au-Ni/MgAl2O4 catalyst at 450-500℃.With comprehensive characterizations by using BET,H2 chemisorption,H2-TPR,XPS,XRD,STEM,EDS,TEM,TG/DTA,Raman and TPH,we found that Au and Ni formed bimetallic nanoparticles of ～10nm with electron donation from Ni to Au.The deposited carbon on the spent Au-Ni/MgAl2O4 is very similar to that on the spent Ni/MgAl2O4 in the nature and in the gasification behaviour but is significantly less.These results suggest that the enhanced coke-resistance of Au-Ni/MgAl2O4 is presumably due to the suppression on CO disproportionation by modifying Ni with Au.