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During the storage and launch process of the carrier rocket, filling, transfusion, storage and launch of the propellantsmay have the leak safety issues. In the event of a leak, flammable, explosive, toxic and corrosive characteristics of propellants, will be the bad consequences and the seriously affect for the test mission. The environmental monitoring system proposed in this paper, it adopts B/S architecture design, the real-time environmental information around the launch area is collected by the high-precision sensors arranged in the key position, it applies the big data analysis techniques and ARIMA model, realizes the monitoring and early warning of the propellant leakage, the environmental health conditions, the operation state of the air-conditioning equipment and the health status of the personnel in the launch area, calculates the change trend and diffusion of the propellant concentration. After practical application, this system can effectively reduce the risk of the test task, meets the construction requirements of the environmental monitoring syetem in the launch site, should be promoted.