The hot corrosion behavior of TP310HCbN austenitic heat resistant stainless steel were studied in 80%Na2SO4 + 10%K2SO4 + 10%KCl molten salts at 600 ℃, 650 ℃ and 700 ℃, respectively. The result showed that when the samples were tested at 600 ℃ and 650 ℃ sulfides was detected at the grain boundaries of substrate, which manifested that intergranular corrosion was occurred. However, when the sample corroded at 700℃ the corrosion products spalled from sample surface on a large scale, which led to serious mass loss during the tests. The surface morphology, microstructures and composition of corroded samples were examined by SEM/EDS and XRD. The corroded products on the samples surface were mainly composed of Fe3O4 and(Fe,Cr)2O3 with small amount of NiCr2O4 and Cr2S3.