To study the vegetation root systems of the arid inland river bank slope erosion quantitative influence of the process,taking the tarim river as the research object,the BSTEM model was adopted to simulate the scour process of 8 typical bank slopesin two successive hydrological years 2016—2017.The quantitative effects of the root systems of six typical desert vegetation species (Alhagi sparsifolia(AS),Tamarix ramosissima(TR),Phragmites australis(PA),Glycyrrhiza uralensis(GU),Populus euphratica(PE),Nitraria tangutorum(NT)) on the riverbank scour were analyzed.Results demonstrated that:(1) The collapse of the Tarim River bank basically occurred in recession period and dry period.The stability of bank slope changed periodically in hydrological years.The safety factor F_s fluctuated slightly between dry period and level rising period,and was stable on the whole and riverbank.F_s increased briefly at the high-water level during the flood period.Subsequently,with the erosion of water flow and the decline of water level,F_s continued to decline until the riverbank collapses,and then entered the cycle of the next hydrological year.(2) The improvement effect of vegetation root systems on the stability was different at different water level periods,which was as follows:flood period > level rising stage > dry period > recession stage.(3) There was a significant difference in stability enhancement among different vegetation types,as follows:NT > AS > GU > TR > PE >PA.(4) At different water lever periods,the reduction effect of vegetation root systems on the amount of riverbank flushing was different,recession stage > flood period > level rising stage > dry period.The root system reduced the amount of riverbank flushing by 0.77% to 49.36%,and the effect of different vegetation on the amount of riverbank flushing was different,which was as follows:NT > GU > TR > AS > PE > PA.The effect of different vegetation on the stability of safety factor and the reduction of bank slope washing volume was basically the same.The results can provide theoretical reference for the ecological management of Tarim River.