Through the analysis of the characteristics of the process control instrument, combined with field bus technology, the fieldbus process control instrument platform based on ARM is designed. A variety of process parameters can be measured by the instrument control platform, thus temperature, flow, liquid level and process parameters can be detected and controlled. The instrument control platform has the characteristics of versatility, simple hardware structure, high cost and other advantages, and its hardware and software can be cut, which makes the instrument control platform has broad application prospects. The article focuses on solving the problem of the instrument network design. The communica-tion interface of the designed instrument control platform complies with Profibus DP and CAN fieldbus standard, which can achieve the function of single work, multi-machine networking, remote monitoring and others.