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According to the production safety problem caused by toxic gas leak, which may occur in the productive process of petrochemical plants, we have been designing an online monitoring platform of toxic gas leak for petrochemical plant. The platform consists of PC monitoring center, network monitoring center, portable devices and android mobile terminal. It can realize real-time, online monitoring and early warning for the toxic gases and environment parameters in petrochemical plant, and made the production supervisors grasp the toxic gases’ real-time dynamic information of petrochemical factory, remove the factors that would lead to dangerous accidents immediately, control the risk in the initial stage, so as to realize the safe, sustainable and efficient chemical production. The testing results show that the all functions of the platform can be accomplished with stable operation,security and practicability.