In this paper, failure evolution of thermal barrier (TBC) coated specimen relating to mechanical behaviors of the bond coat material under various temperatures and loading conditions will be discussed. As the first phase, monotonic tensile tests were carried out on bond coat material in the temperature range of 25 to 1000℃. Special emphasis put on establishing the ductile to brittle transition temperature (DBTT) of the bond coat. As the second phase, isothermal low cycle (IT-LCF) fatigue and thermo-mechanical (TMF) fatigue tests were carried out on thermal barrier coated ni-based super alloy in the temperature range of 500 to 900℃. After the testing, the specimens were sectioned to understand their failure mechanisms. Main importantly it has been observed that the number of cracks in the bond coat significantly changes by the test condition. This particular behavior may lead to a specific failure to the TBC specimen