Honeycomb　sandwich　plate　have　been　widly　applied　in　industry　design　in　recent　years.　In　this　paper,　we　study　the　cubic　hypernormal　form　(the　simplest　normal　form　and　the　unique　normal　form)　for　honeycomb　sandwich　plate　dynamics　model　with　the　help　of　Maple　symbolic　computation.　Firstly,　we　get　the　average　equation　of　four　dimensional　cartesian　form　by　using　the　method　of　multiple　scales　perturbation　analysis.　Based　on　the　method　combined　new　grading　function　with　multiple　Lie　brackets,　we　obtain　the　hypernormal　form　of　cubic　truncated.　The　results　will　further　enrich　the　research　for　dynamics　of　honeycomb　sandwich　plate　model,　and　is　also　the　basis　for　higher　order　normal　form　research.