The　implementation　of　shared　parking　program　can　effectively　increase　the　utilization　rate　of　existing　parking　space　resources.　At　present,　shared　parking　program　has　not　been　widely　practiced　in　China,　and　the　prerequisite　for　this　prospect　to　be　implemented　is　whether　the　private　parking　space　owner　group　can　quickly　and　widely　accept　shared　parking　program.　In　this　study,　considering　the　differences　in　the　economic　development,　urban　planning,　and　parking　pressure　in　cities　of　different　levels,　the　theory　of　planned　behavior　and　the　benefit-risk　perception　model　(C-TPB-BRA)　are　combined　as　the　theoretical　framework　to　explore　the　intention　to　share　parking　space　from　the　perspective　of　the　owners　of　private　parking　spaces　in　cities　of　different　levels.　Based　on　China＇s　empirical　data,　structural　equation　models　are　built　to　verify　the　hypotheses　proposed.　Our　results　show　that　(a)　the　intention　of　private　parking　space　owners　in　different　levels　of　cities　to　participate　in　shared　parking　and　the　mechanism　of　action　of　the　psychological　factors　are　different,　and　not　all　psychological　factors　have　a　direct　impact　on　the　intention　to　share.　In　first-tier,　second-tier,　and　third-tier　cities,　Subjective　Norm　(SN)　and　Perceived　Behavioral　Control　(PBC)　indirectly　affect　Behavior　Intention　(BI)　through　Attitude　(ATT),　Perceived　Benefit　(PB),　and　Perceived　Risk　(PR).　In　the　fourth-tier　cities,　SN　and　PBC　directly　affect　BI.　Except　for　BI,　other　psychological　factors　influence　each　other　significantly;　(b)　the　psychological　factors　affecting　the　intention　to　supply　shared　parking　spaces　in　first-tier,　second-tier,　third-tier,　and　fourth-tier　cities,　respectively,　are　PB　＞　ATT　＞　PR,　PB　＞　PR　＞　ATT,　PB　＞　PR　＞　ATT,　and　PB　＞　SN　＞　PBC　＞　ATT　＞　PR.　Our　research　results　could　help　determine　the　internal　factors　that　affect　the　intention　of　parking　space　suppliers　and　their　mechanisms　of　action　to　participate　in　shared　parking,　and　on　that　basis,　our　findings　could　also　help　governments　and　platform　operators　to　promote　shared　parking　development　plans.