With　the　improvement　of　metro　networks,　sustainability　in　influencing　area　of　stations　has　been　a　focus　in　recent　research.　The　gravitational　model　between　cities　from　a　geographical　perspective　has　received　great　attention,　but　there　is　a　lack　of　research　effort　in　explaining　the　gravity　form　for　metro　stations.　Based　on　Beijing＇s　points　of　interest　and　shared　bicycle　data,　we　propose　a　gravity　model　with　five　indicators.　The　model＇s　effectiveness　is　verified　by　the　mixing　proportion　of　shared　bicycles　in　the　paired　stations.　Results　show　that　there　is　a　correlation　between　the　gravity　and　mixing　proportion　of　shared　bicycles,　with　a　correlation　coefficient　of　0.989.　Of　the　13　pairs　of　selected　metro　station　catchments,　84.62%　of　the　functional　mixing　degree　was　above　1.7,　and　the　average　connection　ratio　of　shared　bicycle　was　3.89%.　Therefore,　the　gravity　model　proposed　provides　a　basis　for　the　sustainability　of　urban　planning　and　management.　©　ASCE.