Abstract: The terrential rain which occurred in Liaoning region during 15 to 17 August 2013 caused significant economic losses to the local area. This experiment analyzed rainfall intensity and persistence of ＂8·16＂ heavy rain in different regions of Liaoning Province based on analyzing high and low-altitude weather conditions, water vapor conditions and vertical movement conditions by using the sounding data, ground data and ECWMF reanalysis data. The results showed that the large-scale and mesoscale circulation field provided a favorable background condition for the terrential rain, the high-altitude jet stream and the low-altitude shear provided good dynamic lifting conditions. The terrain and regional water vapor were important factors associated with the differences of rainfall intensity and precipitation in different regions. During the whole weather process, the highest total rainfall amount and the longest persistence duration were observed in Qinyuan County, which resulted in a huge loss; the hour maximum rainfall intensity was found in Heishan County which reached up to 108.2 mm. The heavy rain caused huge losses to the agricultural and animal husbandry production in Liaoning region. The direct economic loss of agriculture, animal husbandry and fishery in Heishan County reached up to 212 million Yuan; the economic loss of agriculture, animal husbandry and fishery in Xifeng County was 274.5 million Yuan; the affected area of crops in Fushun City was 1 803.47 hm^2, and the direct economic loss to agricultural production was 23.66 million Yuan; the total affected area of crops in Xinbin County was 5 244.3 hm^2, the disaster area was 4 387 hm^2, the total harvest failure area was 1 341.5 hm^2, the destroyed cultivated land area was 890.3 hm2, and 135 livestock and 50 sheep died.