Flood　forecasting　in　the　near-dam　area　of　reservoir　is　challenging,　and　the　accuracy　of　forecasting　scheme　usually　cannot　fulfill　the　requirements　of　flood　prevention　and　scheduling.　To　address　these　problems,　the　entire　near-dam　area　of　Wuqiangxi　Reservoir　was　divided　into　ten　subbasins　based　on　the　distribution　of　historical　rainfall　centers　and　the　characteristics　of　runoff　generation　and　concentration.　A　new　forecasting　scheme　was　constructed　using　the　three-source　Xin＇anjiang　model,　the　model　parameters　were　calibrated　and　the　main　causes　of　simulation　errors　were　investigated　based　on　typical　flood　events.　The　results　show　that　the　method　proposed　in　this　study　can　achieve　the　high　accuracy　of　flood　forecasting　and　is　well　applied　in　the　real-time　flood　forecasting　operation　in　2021.　The　results　also　indicate　that　the　lack　of　information　on　flood　releases　from　water　conservancy　projects　is　the　main　cause　of　errors　in　runoff　and　peak　flows.　©　2022,　Editorial　Board　of　Journal　of　Hohai　University　(Nature　Sciences).　All　right　reserved.