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In process of launch vehicle overall project conceptual design, due to the characteristics such as multidisciplinary collaboration, frequent iteration and cross disciplinary interaction, and changeable design, the inconsistency between version and technical states among always happen. A general modeling method for launch vehicle is necessary and corresponding software system is desired. Based on the concept of uniform data source collaborative design, combined with the characteristic of launch vehicle system design and data model, through the definition of four kinds of model which included base information model, concept model, parameter model and external definition model, a modeling method of launch vehicle general master model construction is proposed. Further, by developing software to implement the modeling method, a general collaborative software system architecture based on master model is constructed, which included master model management system, master model modeling tool and the application client. It could achieve the version management, the technology consistency analysis, the data lineage tracing and data showing and application, etc. The implementation of modeling tool for master model and the client software system provides tool support for launch vehicle system design.