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In order to realize automatic measurement and control of a chemical instrument,a system of control and mesurement base on an industrial computer and PAC(Programmable Automation Controller) is designed and set up. The state of lower computer is monitored by the upper computer through Ethernet,the upper computer shows the state fo each value switch and the imformation of temperature,pressure and flow in the instrument. The measurement and control software base on modular development,data structure of workflow and multithreading technology is written. The system was designed to have functions of workflow custommization,automatically alarming,automatically data recording,automatically running,and has been successfully used in chemical instrument. After many experiments and field work,the stability and reliability of the measurement and control system is stable and reliable.