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Reducing radar cross section(RCS) of aerocraft's surface effectively is key issue at the field of plane steal. Structural absorb is present in this paper, using the periodical surface's character of band gap and impedance transition of electromagnetic crystal structure such as PBG, FSS and HIS, put single or multilayer periodical structure on the surface of the shell of aerocraft, and put the varactor diode onto the approximate HIS to join each cell of metal on top layer to realize the electronic control for periodical structure, will establish the active periodical structure. This structure could realize absorbing the exotic electromagnetic wave and restraining surface wave on it. The result of above process is reducing the RCS of the surface effectively. The simulation test prove that this method and technology could reduce RCS 3~14 dB at working frequency band by using single or double layer active periodical structure, and the working frequency band could be tuned by electronic method.