At present the metrological standard instrument and methods are not applicable t o ground meteorological station apparatus. To solve these problems, an autotes t system of ground meteorological station are designed. The characteristic of the system is that the capability autotest of ground meteorological station sensor and data collector is divided. Autotest system of ground meteorologica l station sensors, like temperature, humidity, atmospheric pressure, wind direct ion, wind speed and precipitation sensors, adopt multichannel design, so many sensors can be autotested at the same time and test result provided automatica lly. Autotest system of data collector can make capability autotest for diff e rent data collector system in each ground meteorological station. The designed a utotest system of ground meteorological station enhances the test efficiency o f ground meteorological instruments and ensures the accurate and reliability of ground meteorological observational data.