Based on the Chinese surface climatologically daily dataset, the time and spatial variation of precipitation and relative humidity of 50 winters in the South China are studied by using the methods of climate tendency coefficient, climate tendency rate, and so on. Furthermore the spatial distribution of precipitation uniformity is analyzed by using Gini coefficient. The results show that the precipitation and relative humidity increased from northwest to southeast, the maximum center is located at the inland area near the south of Yangtze River, and the minimum center is located at plateau. The precipitation intensity increased overall, the region along the Yangtze River and part of Yunnan province increased obviously, the maximum climate tendency rate is about 1 mm/ day /10 a, and there is obvious mutation in 1979; precipitation increased slightly, but in the area of Yunnan, Guizhou and part of SichuanChongqin province, the precipitation amount showed a decreasing trend, about -3 mm/10 a, there is no obvious mutation; the precipitation days reduced significantly in the south of Yangtze River, Yunnan and Guizhou province, the minimum climate tendency rate in the southwest of Yunnan is about -10 days /10 a, mutation time is 1980; relative humidity showed a trend of increase or decrease locally, the relative humidity increased(decreased) slightly in the north(south) of the Yangtze River, the trend in south Yunnan is decreased significantly. There is positive relationship between relative humidity and precipitation, especially the relative coefficient with the precipitation amount and precipitation days is up to 0.784 and 0.753 respectively. The spatial pattern of Gini coefficient is similar to that of precipitation, however maximum (minimum) center of precipitation is corresponding to the center of minimum (maximum) of Gini coefficient, the range of maximum or minimum region has some variation in different periods and different months of winter. Generally speaking, most region of central and eastern South China in winter is precipitation homogeneous area, and the southwest plateau is uneven area.

Key words：South China; winter; precipitation; relative humidity