Abstract: Flood disaster was major meteorological disaster of impacting the yield of single-season rice in Anhui province.The relationship between the precipitation,rain days,sunshine hours and relative meteorological yield were analyzed by using meteorological data of 21 stations in single-season rice main production areas in Anhui province from 1961 to 2005.The hazard factors of single-season rice yield losses in typical years were analyzed too.The indexes and grade standards of flood disaster issues to single-season rice were determined by comprehensive consideration of precipitation,rain days and actual crop evapotranspiration.The frequency of flood disaster with different degree for single-season rice was statistically analyzed by using such indexes in Anhui province in recent 45 years.It showed that the area along Yanhuai was the frequent area of flood disaster.

Key words: Single-season rice, Identification of flood disaster, Indexes, Anhui province.