Abstract: The thermal protection system used in the study is an active type structure (withstand both thermal as well as structural loads) in the form of metallic corrugated sandwich. In GPP like ANSYS and NASTRAN (using 2-D heat transfer equation) have ability to do thermal analysis in component level but the customized special software(using 3-D heat transfer equation) have capability to do thermal analysis of assembled structures by giving basic properties (,c,k) of each component. But the main intricacy is the variation of Thermal Contact Conductance (TCC) at metal to metal contact portions of the brazed components. In this work contains transient thermal analysis of a unit cell of MTPS and a parametric study by changing TCC value and finally reach an appropriate value and validated with available experimental value and Compared it with a casting model (no TCC) and collected the thermal data and transfer to ANSYS model. Finally carry out both thermo-structural analysis in ANSYS and bring out the capability of thermo-structural analysis of ANSYS with the support of existing customized software for evaluation of thermal field.