Wireless　sensor　network　are　promising　to　be　used　in　a　wide　range　of　applications,　the　need　to　effective　save　and　retrieve　the　data　will　grow.　Metadata,　self-describing　data　about　sensor　nodes　and　sensing　data,　assist　to　the　data　exchange　between　different　users　and　understand　different　capabilities　provided　by　heterogeneous　sensor　networks.　Metadata　management　in　resource　constrained　sensor　nodes　is　unfeasible.　Meanwhile,　the　agent　is　suitable　to　the　heterogeneous　sensor　network　with　its　characteristics　of　self-organization,　distributed　and　strong　processing　capability.　So,　to　minimize　the　energy　cost　of　sensor,　prolong　the　lifetime　of　sensor　network　and　meet　the　requirements　of　access　to　realtime　data　we　propose　a　framework　that　store　and　collection　metadata　in　mobile　agent.　The　proposed　approach　can　deal　with　complex　metadata　of　heterogeneous　sensor　network　and　achieve　better　performance　in　communication　costs　and　real　time　process.　©　2010　IEEE.