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This paper proposes a boundary layer based optimization method to improve the aerodynamic performance of the waverider under the condition of strong viscous interaction.The Euler results and Navier-Stokes results at different attitudes towards a viscous optimized waverider show that the aerodynamic performance at the design Mach number is seriously affected by the strong viscous interaction effects.According to effective shape determined by a semi-empirical correlation,the displacement thickness is deducted from the lower surface of the original waverider and a family of boundary layer optimized waverider can be generated.Its found that the shock wave position of the optimized waverider is very close to that of the inviscid basic flowfield.The aerodynamic performance,including the lift-to-drag ratio and the longitudinal static stability,is improved for the lower surface by the optimization method,due to the lower pressure near the leading edge.The boundary layer optimized waverider also exhibits higher lift-to-drag ratio at larger angles of attack compared to a waverider with an upper expansion surface.The results demonstrate that the optimization method proposed in the paper can improve the aerodynamic performance of the waverider under the condition of strong viscous interaction significantly.