Abstract: Electromagnetic interference（EMI） is a factor that must be considered in the reliability and security of communication system. Especially in recent years, the rapid development of high power electromagnetic pulse（EMP） causes a serious threat to radar antenna and other communication equipment. This paper proposes a novel electromagnetic energy selective surface（ESS）.The surface adds four metal branches to the cruciform ESS, and PIN diodes are loaded between the units to obtain adaptive characteristics. Metal branch with diodes can make slit in the metal grid structure, it can effectively increase the shielding bandwidth. In addition, the two-dimensional slit array resonate at the high frequency in the transmission.This provides a band at the high frequency for the working signal. Simulation results show that the ESS proposed in this paper will exist a protective mode under the high power electromagnetic pulse, its shielding bandwidth is 3.4 GHz for insertion loss(S₂₁) ＞-20 dB. ESS will locate in the transmission mode under the working signals and the surface can be seen as the frequency selection surface（FSS） with two band. The bandwidth at low frequency is 0 GHz～1.3 GHz and surface can operate in 5.36 GHz with a bandwidth of 150 MHz.