In　view　of　the　insufficient　researches　on　shared　through-right　turn　lanes　capacity　at　signalized　intersections　in　China,　the　paper　investigates　the　traffic　operation　of　shared　through-right　turn　lanes　and　analyzes　the　traffic　characteristics.　Based　on　the　measured　data,　the　saturation　headway　of　vehicle　for　different　shift　is　analyzed　using　the　T-test　statistical　method,　that　the　results　show　that　a　significant　difference　between　the　saturation　headway　of　through　and　right-turn　vehicles　are　existed.　Then,　a　theoretic　model　for　through-right　turn　lanes　capacity　is　developed　by　saturation　flow　rate　correction　theory　and　probability　methods.　This　study　provide　a　theoretical　basis　for　planning,　design,　transformation,　traffic　organization,　signal　timing,　operations　evaluation　and　lane　setting　at　signalized　intersections.