Abstract: As an inevitable structural defect of thermal barrier coatings, the existence of pores is random and its distribution position has great influence on the residual stress of thermal growth oxidation (TGO) interface. In order to better understand the effect of porosity on the interfacial stress of TGO in thermal barrier coating, the effect of single pore on the residual stress of the TGO interface was considered, the variation of residual stress at TGO interface was analyzed by changing the distance between pores and TGO interface, the pore location and pore size. The results showed that when the radius of the circular pore was 5um and the distance from the TGO/TBC interface was 35um, the porosity was shown almost no influence on the residual stress in the TGO interface, and the closer the pore to the interface, the greater the influence of the residual stress on the size and distribution. When the distance was fixed, the smaller the pore size was, the smaller the interfacial residual stress would be.