Parking　guidance　information　system　(PGIS)　can　guide　the　drivers　to　park　as　quickly　and　accurately　as　possible,　it　also　relieve　the　traffic　pressure　due　to　parking.　Wireless　sensor　network　(WSN)　is　applying　in　various　fields　for　its　low-cost,　low　power-consumption　and　easy　installation.　Therefore,　WSN-based　PGIS　can　obtain　great　benefits.　In　this　paper,　the　advantages　of　the　PGIS　are　briefly　described,　the　main　problems　of　traditional　PGIS　data　collection　methods　are　discussed　and　the　architecture　of　the　PGIS　is　outlined,　parking　lots　and　road　networks　are　separately　divided　into　several　WSNs,　hardware　design　of　sensor　node　and　sink　node　is　described　with　the　purpose　of　reducing　the　power-consumption　and　decreasing　the　cost　of　WSN,　TDMA　is　compared　with　CDMA　while　used　in　the　PGIS,　and　time　slots　are　introduced　to　assign　to　the　sensor　node.　Frame　structure　and　format　are　given.　Finally,　the　future　research　on　wireless　sensor　network　for　parking　guidance　information　system　is　also　predicted.