A　software　for　getting　various　order　electro-optic　and　electrostriction　coefficient　tensors　which　belong　to　the　group　SO(2)　was　programmed　by　means　of　Matlab,　based　on　group　theory.　The　general　forms　of　third　order　and　fourth　order　electro-optic　coefficient　tensors,　as　well　as　second　order　and　third　order　electrostriction　coefficient　tensors,　having　the　symmetry　of　the　group　SO(2)　were　got　with　the　help　of　the　software,　and　their　invariance　under　arbitrary　rotation　about　the　z-axis　in　physical　coordinate　system　was　verified　through　transformation　of　coordinates.