Abstract: The paper aims to quantitatively evaluate the amount and characteristics of cloud water resources of Jiangsu Province. According to the function of inflow and outflow of cloud water, the cloud water resources were defined as the resources which participated in the recycle of atmospheric cloud water, but did not fall in ground. The fields of wind and cloud water content from the high resolution reanalysis data (ERA-Interim) during 1981-2010 were applied to calculating the total annual amount of cloud water resources of Jiangsu Province in average, whose spatial-temporal characteristics and variation trend were analyzed. Results showed that: the annual average amount reached 35.31 billion tons. It was more in spring and summer, but less in autumn and winter. In drought (water shortage) period, the amount reached the maximum of 7.08 billion tons within the areas in Huaibei along the Huai River, followed by that in the coastal reclamation region and areas around Taihu Lake, respectively. The amount during non-drought period accounted for 58.3% of the total annual amount. The cloud water resources of Jiangsu had a decline of 1.8 billion tons per decade within the past 30 years. It is suggested to increase the exploitation intensity and realize the normalization of exploitation of the resources. The major operation areas should be established in Huaibei, the coastal region and around Taihu Lake. In order to improve the efficiency of exploitation, the technology should be advanced.