This paper is about energy problem in SAR jamming. A new concept of Jamming Energy Equivalence (JEE) is presented here. The concept implies that SAR warfare is still power warfare, though SAR is interference radar. This paper indicates that different jamming methods only lead to different distribution of the jamming energy in SAR image, which is useful to the choice of jamming method and the building of jamming system. In addition, this paper gives the jamming equation of SAR.