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Emergency control system is the combination of power grid side Battery Energy Storage System (BESS) and Precise Load Shedding Control System (PLSCS). It can provide an emergency support operation of power grid. The structure and commission test results of Langli BESS is introduced in this article, which is the first demonstration project in Hunan. The composition and operating principle of BESS are comprehensively analyzed. Additionally, the architecture, strategies and test methods of emergency control system are deeply discussed. Moreover, the calculation model of the power grid side energy storage power station is established and the cost-benefit analysis of Langli BESS is analyzed. The relevant discussions have been verified by engineering project and have certain practical value.