It　is　of　great　significance　to　study　the　status　of　eutrophication　and　its　process　in　water　source　reservoirs　by　analyzing　the　spatial　and　vertical　distribution　characteristics　of　phosphorus　forms　in　the　sediment　of　Yuqiao　Reservoir　in　Tianjin.　The　samples　of　surface　sediments　and　sediment　cores　were　collected　by　grab-type　sampler　and　column-type　sampler,　respectively,　and　the　phosphorus　forms　of　sediments　were　analyzed　by　continuous　extraction　method　proposed　by　Psenner,　in　order　to　reveal　the　spatial　distribution　of　various　forms　of　phosphorus　in　the　reservoir,　as　well　as　the　distribution　in　the　vertical　direction　of　different　regions.　The　results　showed:　The　contents　of　total　phosphorus　in　the　surface　sediments　of　Yuqiao　Reservoir　were　303.7-997.8　mg/kg,　and　the　order　of　the　mass　fraction　of　phosphorus　forms　was:　Ca-P＞Fe-P＞Res-P＞Al-P＞Org-P＞Ex-P.　The　Fe-P,　Al-P,　Ca-P　and　TP　in　the　surface　sediments　gradually　decreased　from　east　to　west,　mainly　affected　by　the　input　of　exogenous　phosphorus　entrained　by　the　Lihe　River.　The　Res-P　is　gradually　increasing　from　east　to　west,　contrary　to　the　distribution　of　active　phosphorus,　indicating　that　the　water　quality　in　the　downstream　of　the　reservoir　is　better　than　that　in　the　upstream.　For　the　vertical　distribution,　there　is　little　difference　between　the　bottom　sediments　and　the　surface　sediments　in　the　southern　region,　which　indicates　that　the　deposition　amount　of　phosphorus　is　relatively　large　since　the　1960s;　and　the　Fe-P　and　Org-P　contents　in　the　western　sediments　are　higher,　and　the　trend　is　significantly　reduced　as　the　depth　increases.　The　various　forms　of　phosphorus　and　TP　contents　in　the　central　area　are　almost　the　lowest,　and　gradually　decrease　with　the　depth,　phosphorus　in　the　sediments　at　this　stage　is　mainly　retained　with　small　release　potential.　©　2018　by　Journal　of　Lake　Sciences.