In　allusion　to　problems　that　continuous　deck　structure　of　simply　supported　beam　bridge　was　vulnerable　to　crack,　leak　and　edge　failure,　a　formula　of　stress　in　the　continuous　deck　structure　under　the　combination　of　vehicle　loading　and　the　temperature　effect　was　deduced　by　structural　mechanics　in　terms　of　linear　elastic　theory.　Furthermore,　the　formula　was　verified　by　the　ABAQUS,　considering　a　certain　project　as　an　example.　Based　on　the　comprehensive　analysis　of　mechanical　properties　for　the　continuous　deck　structure,　it　was　found　that　main　factors　were　thickness,　unbounded　length　and　material　types.　Influences　of　above　parameters　on　the　stress　and　mid-span　deflection　of　continuous　deck　structure　were　considered　according　to　the　further　analysis.　Meanwhile,　main　parameters　influencing　the　stress　of　continuous　structure　on　deck　were　analyzed　as　well.　The　results　show　that　the　formula　can　be　used　to　accurately　calculate　mechanical　parameters　for　continuous　deck　structure　under　vehicle　loading　and　the　temperature　effect.　The　stresses　at　the　top　and　bottom　of　concrete　pavement　decrease　dramatically　with　the　increase　of　pavement　thickness　and　the　maximum　stress　on　top　surface　is　in　linear　relationship　with　thickness.　Comparing　the　asphalt　concrete　pavement　with　the　conventional　concrete　pavement,　the　maximum　principal　tensile　stresses　of　them　on　top　surfaces　are　almost　the　same,　but　the　latter　has　much　larger　tensile　stress　on　bottom　surface.　It　is　reasonable　to　combine　the　asphalt　concrete　pavement　with　the　cast-in-place　concrete　pavement.　It　is　effective　to　increase　the　thickness　of　concrete　pavement　and　set　unbounded　areas　for　the　improvement　of　mechanical　properties.　Setting　the　unbounded　area　will　be　the　most　efficient　way　to　remarkably　reduce　the　maximum　tensile　stress　on　the　deck　when　the　unbounded　length　is　about　5%　of　each　span.　In　a　word,　the　results　provide　a　theoretical　guide　for　the　mechanical　calculation　and　an　accurate　method　of　continuous　deck　structure　of　simply　supported　beam　bridge.　©　2017,　Editorial　Department　of　China　Journal　of　Highway　and　Transport.　All　right　reserved.