Abstract: The baking system of Experimental Advanced Super-Conducting Tokamk(EAST) vacuum vessel is necessary to obtain the baking temperature of 150 ℃. In order to define suitable alloy heaters and achieve their reasonable layouts, thermal analysis was carried out with ANSYS code. The analysis results indicate that the temperature distribution and thermal stress of most parts of EAST vacuum vessel ports are uniform, satisfied for the requirement, and are safe based on ASME criterion. Feasible idea on reducing the stress focus is also considered.