Abstract: Scramjet components were preliminarily designed in this paper according to concept of integration design.The flow-fields and performance of the two-dimension configuration were simulated using CFD methods,and the numerical results were found to agree well with experimental data.The flow-field and performance variation-trends of each component and the whole engine were analyzed and summarized,and the difference of engine performance under work and off-work state was compared.The research results can provide a reference for researches on integration design and performance of scramjet.