For the low-head hydro-junction,we usually adopt the way of stilling basin’s bottom underflow energy-dissipation to reduce the sluice discharge’s flow energy.The location of the baffle pier has a great influence on the form and strength of the hydraulic jump,which affects the dissipation of the stilling basin.Adopting the computational fluid dynamics software Fluent’s VOF model,we investigate the effects of the location of the baffle pier on the stilling basin,inland waters jump’s characteristics,distribution of the turbulent kinetic energy dissipation rate and energy dissipation ratio.The results show that the location of baffle pier will affect the stilling basin energy dissipation.When the baffle pier is arranged at the 0.65 and above length of the baffle basin,there is a tiny difference about the effect of energy dissipation; When the baffle pier is arranged at the 0.35 length of the baffle basin,the energy dissipation ratio of stilling basin is the maximum,with a 5% energy dissipation improvement comparing that when the baffle pier is arranged at the 0.65.