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I introduces the design and construction of global navigation satellite systems (GNSS) vulnerability simulation environment. The simulation environment contains simulation of the signal-in-space environment, simulation of the vulnerabilities in the space segment, vulnerability assessment and validation. It provides a set of integrated simulations of different types of interference in the GNSS signal propagation domain, including electromagnetic interference, atmospheric disturbances, multipath, and interference in the inter-satellite link. This paper focuses on the design of the main system modules and testing through an experimental analysis. Through the evaluation method established and verification procedures and approaches, Complete the space segment vulnerability link simulation, monitoring the inter satellite link SAIM, analysis of the GNSS vulnerability assessment software to realize data results. The experimental results show that the system scheme is reasonable and effective.