In　order　to　solve　the　data　security,　reliability　problems　of　wireless　communication　in　the　ETC　embedded　data-communication　system,　this　paper　has　analyzed　the　hardware　structure　which　the　system　required,　and　paid　an　in-depth　study　on　AES　encryption　algorithm　that　the　hardware　encryption　engine　applied.　On　this　basis,　the　article　has　proposed　the　proposal　that　taking　advantage　of　AES　hardware　encryption　engine　for　full-text　encryption　of　plain　text　in　the　wireless　communication.　Through　experimental　tests,　it　has　proved　the　feasibility　and　the　data　wireless　transmission　security　of　ETC　embedded　data-communication　system　that　the　article　designed.