Abstract: The steam stimulation exploitation of super heavy oil is of obvious characteristic of interlayer steam breakthrough, resulting inloss of productivity and not producing of the reserves in area with steam breakthrough. Because the steam injection pressure is much higher than the reservoir pressure, a number of cracks may produce between casing and cement sheath after a period of production by steam stimulation process. Follow?up injected steam will flow up along the cracks and enter into overlying sand layer from the weak parts of cement sheath. When the steam amount reaches a certain degree and steam injection continues, the steam will erupt from the weak parts of the sand layer and form steam breakthrough. The reason for this is that the production?steam injection ratio is less than 1 and long?term steam injection in high pressure during steam stimulation development of the super heavy oil in this area. It is suggested that to increase the drainage capacity and plug the cracks in casing are the feasible solutions