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Helicopter rotor blade design involves complex multidisciplinary analysis and simulation, such as aeroelastic analysis, structure analysis and dynamics simulation. In this paper, we present a simulation integration framework - RotorSIM, which integrates the analysis and simulation processes in the rotor blade design into a unique platform. The architecture, the main components, as well as the key techniques of the system, are described. A case study shows that RotorSIM can help engineers to improve their working efficiency in the blade design.