Seeding effects investigation or evaluation is one of the most important parts of weather modification. It also acts as a crucial standard of assessing the scientific and technological level of weather modification activities, and plays an extremely important role in promoting the development of the subject. Combining the weather modification activities in Beijing region in recent years, the seeding effects of precipitation enhancement and the economic benefits of hail suppression from 2004 to 2010 was assessed, based on the classical method of historical regional regression and the agricultural disaster data collected around the whole region. The results show that: (1) In the assessment period from May to September, the average ratio of precipitation enhancement efficiency tends to maintains about 20% following with the sample numbers accumulated year by year. In the target area selected, cloud seeding totally increased the precipitation amount by 417.8 mm during the 7 years. The statistical seeding effect is very manifest in a high significance level. (2) The estimated average annual economy benefit of hail suppression is nearly 248 million yuan. The average cost-benefit ratio is about 1:16. The highest and the lowest economy benefit appeared in 2009 and 2005, with a corresponding cost-benefit ratio of 1:27 and 1:6, respectively. The methods studied for seeding effects evaluation and the results help to strengthen the scientific and technological base of the exploitation and utilization of cloud water resource in Beijing and its neighboring region, and firmly supporting the construction of local disaster prevention and mitigation projects as well.
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