In the development of the advanced spent fuel management process based on the molten salt technology, it is essential to choose the optimum material for the process equipment handling molten salt. The effect of alloying elements on the corrosion of austenitic alloys in molten salts was investigated in the temperature range of 650~850 ℃. Due to Li2O-induced basic fluxing mechanism, the corrosion rates of the alloys in the mixed molten salt of LiCl-Li2O were significantly higher than those in LiCl molten salt. In the mixed molten salt, Hastelloy C-276 with high Mo and W contents exhibited the highest corrosion rate among the examined alloys and KSA(Kaeri Superalloy)-33 with low Cr content showed less corrosion rate.