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四川省位干亚热带气候区内，是洪涝灾害多发区，每年的洪涝灾害出现在5—10月，主要集中在7、8月。根据洪灾的严重程度把它分为一般和严重两类，一般洪灾遍及全省，灾情轻，严重洪灾出现在四川盆地，灾情重。其特点是降水强度大、量多且集中；灾害突发性强、来势凶猛、危害大、灾情重；发生频率高且地理分布不均．开始和结束月地理分布不均；有持续性和阶段性等特点。在全省，盆地西北部和西南部、雅砻江中游两岸、阿坝州中部洪涝灾害多。未来趋势预测：从1998—2003年，是洪涝灾害的多发期，2004—2010年进入由多到少的时期。
In Sichuan sub-tropical climate zone, is flood prone area, annual floods appear in May-October, mainly in July and August. According to the severity of the flood, it is divided into two types, general and serious. The general floods spread all over the province. The severe and serious floods occurred in the Sichuan Basin and the disaster was heavy. It is characterized by large rainfall intensity, large amount and concentration; sudden strong disaster, ferocious, harmful, disaster heavy; high frequency and geographical distribution of uneven. Uneven geography distribution at the beginning and end of the month; characteristics of persistence and staging. In the whole province, there are many flood and water disasters in the northwestern and southwestern parts of the basin, both sides of the middle reaches of Yalong River and in the middle of Aba Prefecture. Future Trend Forecasts: From 1998 to 2003, flood-prone periods were frequent, and the period from more to less entered in 2004-2010.