The automatic pressure control of oxygen is an ideal strategy for steel making to ensure the quality.The author designed a pressure limited and interlock controller for oxygen blowing of converter.Thne operational procedures of pressure limiting and the hardware and software of controller are introduced.%氧压自动控制是保证转炉炼钢质量的理想方案，笔者设计了一套转炉吹氧压力限压及信号联锁控制器。详细介绍自动限压的基本工作过程，控制器的软件、硬件设计。
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