Abstract: In this paper,the effectiveness of the artificial precipitation enhancement technique by means of silver iodide (AgI) flame bomb carried by balloon in Kazuo of Chaoyang was analyzed on the basis of the experimental data from 2003 to 2017.The results show that the best effect is achieved under the three synoptic situations including Mongolia cyclone,short-wave trough,and cold-vertex.The experiments show that the optimal seeding heights of the flame bomb in the process of snow and rain enhancements are respectively 2000-4000 m and 3000-5000 m,especially for the St,Ns and As in the stable layer-form clouds.Under the condition of the temperature of -10℃,the average generative rate of ice nucleus is 6.3×10¹³ per gram.The average annual precipitation in Kazuo county is 505.87 mm and is 57.54 mm more than the other counties of the Chaoyang.The average annual amount of the increased rainfall is 129 million m³.Whereas,the increasing amount of annual rainfall from the artificial precipitation enhancement using the balloon flame bomb is 31.31 mm which is converted into the water of 7.007×10⁷ m³.The ratio of the input to the output is 1:97.1.The above-mentioned precipitation enhancement method is able to provide the scientific reference and technical support for relevant businesses in other areas.

Key words: Balloon, Silver iodide flame agent, Precipitation enhancement, Effectiveness analysis