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干旱是制约甘肃农业发展和国民经济建设的主要自然因素。统计与分析历代气象资料便可得出：干旱具有阶段性、持续性反季节特征和区域特征。了解其干旱特征，为农业和国民经济发展作好气象预测和服务。
Drought is the main natural factor that restricts Gansu’s agricultural development and national economic construction. Statistics and analysis of past meteorological data can be drawn: the drought has a periodic, continuous anti-season features and regional characteristics. Understand the characteristics of its drought, make predictions and services for the development of agriculture and national economy.