Impact of Precipitation on Agricultural Drought during the Crop Growing season in Jianchang of Liaoning Province

[Objective]The aim is to provide climate basis for agricultural production through analyzing precipitation variation and mastering drought degree.[Method] By using mathematical statistical methods,comparison and trend analysis,the impact of precipitation change on drought is analyzed.[Result]The precipitation during the crop growing season in the late 50 years decreases by 108 mm,especially in summer.The frequency of the serious drought in spring and autumn is 80%.Compared with the second national survey of agricultural resources,the frequency of drought increases by 26.6% in the crop growing season,decreases by 13.6% during the sowing and seedling stage,grows by 7.7% during the vigorous growth season and increases by 19.2% during the maturity and harvest stage.[Conclusion] The current climate in Jianchang is developing from slightly drought to semi-humid and semi-arid.