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Currently, most testing equipments in the provincial level meteorological metrological laboratories are equipped with the programmable interface of RS232 In order to improve the calibration efficiency of the temperature sensors, the serial communication protocol of such devices as SR253 thermostats, high accuracy thermometers and three kinds of scanning collectors in common use and so on are discussed. An automatic calibration system for temperature sensors is designed in combination with the database of SQL Server 2000 based on the VB60 development platform. The experimental results show that the automatic verification system is reliable and easy to operate with high commonality, which improves the verification efficiency significantly, avoids the arbitrary factors which may be caused by manual testing, and is able to provide high quality calibration.