In order to meet the needs of the frequently rocket launch, according to the characteristics of rocket engine, a integration design system for rocket engine was constructed to improve the standardization, dependability and efficiency. Digitalization design and modularity design in the whole design flow were actualized by integration of design methods, program, parameters and software, and thorough analysis of liquid rocket engine design information. The design flow and result of turbo pump integration design are described. The advantages (high integration, modularity, multidisciplinary comprehension, high efficiency and high reliability) of integration design system for liquid rocket engine are elaborated in detail.