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The differences are compared and analyzed between soil relative humidity measurements from HYASF AWS (Automatic Weather Station) and conventional observation at Nancheng Station from 8 September 2005 to 28 January 2007 by means of the difference probability and correlation analysis methods. The results show that data consistency is best at 40 cm and 50 cm, and worst at 5 cm and 10 cm; automatic humidity values are higher than manual ones as the whole, and differences in rainless periods or dry season are often less than those in rainy periods, but there is still significant correlation between them in all layers. The results can provide an objective basis for evaluating the monitoring capability of HYASF automatic stations.