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Controlling the temperature and humidity in archives is vital important to preserve files well because me quality of files saving has close relation to the temperature and humidity records in archives. The paper designs an automatic temperature and humidity measuring and controlling system based on field-bus in archives through practicing in the actual project. The system takes WinAC as the master station of field-bus, S7-200PLC as the subordinate station to form a Profibus-DP field-bus communication system. The monitoring software has been designed with WinAC. It can meet the needs of the various functional requirements, such as temperature and humidity measuring and regulating, data-preserving and exporting, reasons alarming and so on.