In this study,a new hydrological drought assessment index named Standard Water Resources In-dex(SWRI) was established. Based on the SWRI,and a basic framework of hydrological drought identifica-tion,assessment and characteristic analysis was developed by combining the distributed hydrological model,Copula functions and statistical test methods. Taking the Northern Haihe River as a case,the hydrologicaldrought events between 1956 and 2009 were identified quantitatively,and the hydrological drought character-...