With　the　help　of　computer　symbolic　computation　software　(e.g.,　Maple),　abundant　interaction　solutions　of　sine-Gordon　equation　are　obtained　by　means　of　a　constructed　Wronskian　form　expansion　method.　The　method　is　based　upon　the　forms　and　structures　of　Wronskian　solutions　of　sine-Gordon　equation,　and　the　functions　used　in　the　Wronskian　determinants　do　not　satisfy　linear　partial　differential　equations.　Such　interaction　solutions　are　difficultly　obtained　via　other　methods.　And　the　method　can　be　automatically　carried　out　in　computer.