Abstract: Taking the tobacco productivity and economic benefit as indexes,the effect assessment of artificial precipitation were stimulated with the double-contrast,the region regression and direct economic efficiency estimation.The effect of artificial precipitation in Western Guizhou during April and May from 2001 to 2009 was evaluated.The results showed that the average precipitation increased 314.2% and the economic benefit increased 0.743 billion Yuan RMB.The artificial precipitation had positive effect to the tobacco planting area and economic benefit in western Guizhou.When average rainfall increased 350%,the tobacco planting area could reach 7000ha.When average rainfall increased not be more than 150%,the tobacco planting area could not be more than 5200ha.

Key words: Western Guizhou, Western Guizhou, Artificial precipitation, Method of the double-contrast, Method of the region regression, Tobacco, Effect evaluation