Wireless　Sensor　Networks　(WSNs)　have　attracted　more　attentions　due　to　its　low　cost　and　convenience.　Despite　the　great　potential,　power　supply　restricts　the　application　of　WSNs.　Especially　in　the　environment　such　as　rural　areas,　underground　and　underwater　structures,　the　electrical　wire　or　battery　increases　the　cost　of　installation　and　brings　the　unexpected　inconvenience..　In　this　abstract,　a　far-field　radio　frequency　(RF)　powered　wireless　sensor　network　is　presented.　Moreover,　a　mesh　network　approach　is　proposed　to　solve　the　data　collision　issue　caused　by　the　discontinuous　power　supply.　Test　results　verify　the　feasibility　and　reliability　of　this　WSNs.