In order to study the effects of through flow intensity and relative Rayleigh number r on the flow pattern and its associated physical quantities, this study carried out a two-dimensional numerical simulation of the fluid under the conditions of the Prandtl number Pr=6.99 and uniform heating in the rectangular cavity Γ=20 with a tilt angle 10°. The results showed that: when the flow intensity and heat work together, and the relative Rayleigh number is constant, the Reynolds number Re has obvious effect on the convection pattern, but the ability to affect the maximum vertical velocity wmax and Nusselt number Nu is limited. When the flow intensity and the heat work together, and the Reynolds number Re is constant, the relative Rayleigh number r has a significant effect on the convective pattern, the maximum vertical velocity wmax and the Nusselt number Nu.