A　quantum　secure　direct　communication　(QSDC)　protocol　based　on　the　hyper-entangled　state　is　proposed　to　improve　the　efficiency　of　eavesdropping　detection　in　an　improved　＂ping-pong＇＇　protocol,　in　which　we　use　the　hyper-entangled　state　to　detect　eavesdropping　during　the　quantum　communication.　In　the　security　analysis,　we　use　the　entropy　theory　method　to　calculate　the　amount　of　information　and　compare　the　detection　strategy　of　two　QSDC　protocols　quantitatively　by　comparing　the　constraint　between　the　maximal　amount　of　information　that　the　eavesdropper　can　get,　and　the　probability　that　the　eavesdropper　is　detected.　The　probability　of　being　detected　will　be　50%　in　the　original　QSDC　protocol　which　based　on　the　Bell　states　if　the　eavesdropper　attempts　to　get　all　the　information,　however,　in　the　proposed　protocol　this　probability　can　reach　75%,　which　indicates　that　the　proposed　protocol　is　more　secure.