An investigation has been made of the dissolution behaviors of metal antimony and bismuth in Na2CO3-NaCl binary eutectic molten salt within the temperature range of 700 oC to 1 000℃. The experiment results show that the dissolution equilibrium of antimony and bismuth can be completed within 20 minutes at 850 oC, with their saturated solubility being 3.80% and 1.39% respectively. The saturated dissolution increases positively with the increase of the temperature, with 4.53% being the highest dissolution of Sb and 2.89% of Bi at 1 000 oC. The XRD and SEM results of dissolved samples show that Sb and Bi, which can exist in the molten salt, do not react with it, with the dissolved antimony and bismuth mainly metallic particles mixed with the molten salt. Therefore, it can be drawn that Na2CO3-NaCl molten salt can serve as an inert medium for antimony sulphide (bismuth) smelting.