Abstract: Based on the analysis of two cases of 110 kV dry-type flexible cable terminals overheating at Changsha Power Supply Company, the causes of terminal overheating are discussed. By using the finite element electric field simulation method, and modeling two different types of dry-type flexible cable terminals, the relevance between electric field strength and over-temperature was revealed, and the development law of surface over-temperature caused by pollution discharge is further combed. The surface field strength of the two different cable dry flexible terminals is quite close to the initial field strength of surface discharge. According to the distribution of surface field strength and the formation mechanism of surface pollution, it was clear that the heating defects was due to the pollution surface discharge of the dry cable terminal. The areas with high electric field on the surface of different dry flexible terminals are located at the upper part of the stress-cone, which is easy to form pollution surface discharge and over temperature. The pollution elimination method can be used to deal with this kind of defect. Meanwhile, targeted operation and maintenance work is required, which greatly reduces the probability of similar problems in the future.