Abstract: The basic foundation and restriction for design of 4-feedsshaped-beam antenna in Ku-band are briefly introduced.Then it emphasizeson the electrical property of antenna system and design method of crucialcomponents.By comparing preexpected results with the tested ones,goodagreement is obtained,it shows that the experimental prototype of 4-feedsshaped-beam antenna in Ku-band,we have developed recently is successful.Finally,future ideas of EM development are presented.