Abstract: To improve wear resistibility of surface cast iron will increase the useful life of grey cast iron directly.This paper presents that local grey cast iron surface is remelted by TIG arc and coated with alloys to incrense the wear resistibility.The influence law of technology parameter of arc current and moving speed etc on surface properties is found.Under different conditions,phase structure,elements distribution,microstructure,hardness and wear resistibility ablut remelting layer are analysed and measured.The resules indicate that grey cast iron surface is strengthened with many kinds of ways by TIG arc local remelting treatment.Expensively,surface alloying hardening effect is best and surface properties are improved remarkably.