The denitrification system is the necessary infrastructure to reduce NOx content in boiler flue gas at the outlet of the coal-fired power plants. How to control the ammonia injection flow become the key factors to control the NOx emission. In this paper, starting from the denitrification system principle, ammonia injection automatic control strategy, we survey the automatic control of denitrification system in simple terms, and propose an optimization strategy based on the mature and advanced control theory. It has an important reference for commissioning and operation of denitration project of other plants.%脱硝系统是燃煤电厂降低锅炉出口烟气NOx含量的必要设施，如何控制喷氨流量则成为控制NOX排放的关键因素，本文从脱硝系统原理、喷氨自动控制的策略等方面入手，深入浅出地论述了脱硝系统喷氨自动控制的概况，并依据先进和成熟的控制理论对此进行优化，对其他电厂脱硝项目的调试和运行也具有重要的借鉴意义。
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