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PLC is a microprocessor as the core of industrial control devices. In industrial control, often by the need for PLC data acquisition and monitoring the work of state control, Visual C++ Is a Windows application development tools, graphics processing and database management has a strong feature, use it to achieve the underlying communication control has a faster rate. This paper aims to explore visual programming language VisualC++ Achieve between computer and PLC serial communication technology, and fully rational use of system resources and features to enhance communication efficiency.