Abstract: In this paper, the shallow water wave model is used to discuss the effect of environmental condition on boundary layer low-level jet and it is obtained thatthe scale of the boundary layer low-level jet is L₀=(ρ₂-ρ₁)/(ν₂ρ₂-ρ₁ν₁)L₀^*C₀^*.Startingfrom this formula, we have concluded that it is advantaged to establish the stronger boundary layer low-level jet in the large scale geostrophic current with stronger vertical shear and high temperature and wet in the low layer atmosphere, while geostrophic wind is stronger and its height is lower, the stronger boundary layer low-level jet may be established.