The balance between macrophytes and epiphyton may apparently be efficient against alteration of transparent,especially in small and shallow water bodies.The integrated Water Quality Model (WQM) and the modified Submerged Aquatic Vegetation Model (M-SAVM) were performed during vegetated season in a shallow reservoir,Yuqiao Reservoir (China).The present study tested whether the mechanistic water quality -macrophytes model realistically represents the sensitivity of the reservoirs macrophyte and epiphyton biomass to phosphorus inputs (TPIN).