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Contrary to hypersonic vehicle's high nonlinear, strong coupling, uncertain parameters and other issues existed in its flight process, This paper presents an adaptive control method based on fuzzy sliding mode boundary layer. Firstly, the longitudinal mode is lined exactly, then by introducing an adjustable parameters as sliding boundary layer, quasi-sliding mode control law based on tangent reaching law is applied on the outside of the boundary layer. However, it is replaced by control law designed by the saturated function in the boundary layer. The parameters is adjusted online by fuzzy logical system, so the high-frequency buffeting which is caused by quasi-sliding mode is eliminated. The simulation results demonstrate that the system can not only track the input, but also possess strong robust and eliminated buffeting.