Precipitation showed the inter-centennial tendency having obvious spatial difference, especially in North China and south of the Yangze River, is opposite to the low frequency change trend.
中国东部降水同样存在数百年的趋势变化，且存在明显的区域差异，特别是华北与江南的低频变化趋势几乎相反。
Precipitation in summer showed a similar trend as the annual precipitation, and precipitation in autumn and winter no evident change trend.
夏季降水与年降水变化趋势类似，秋季与冬季降水波动较小，基本保持平稳。
By using surface data from 1951 to 1996, the long term change trend index of annual and seasonal precipitation of China is calculated.
利用1 951年至1 996年地面气象记录资料，计算了我国全年和季节降水量长期变化趋势特征指数。
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