Abstract: Taking rice yields in non-meteorological disaster year in Heilongjiang Province as the fundamental sequence, calculated the expected yield of all previous years by using the method of Lagrange Interpolation, the yield loss caused by meteorological disasters was extracted from the total yields. Thereby, the yield loss of rice caused by meteorological disasters was assessed for 1949-2004. The results showed that the impact of meteorological disasters was relatively larger than that before 1984. The serious disaster year (yield loss rate≥30%) accounted for 48.6%, the average yield loss rate was 29%, and the yield fluctuation of each year was larger. The disaster resistant ability of rice had been enhanced, and there were no serious disasters since 1984. The average yield loss rate was lowered to 9%. A further analysis between yield losses due to meteorological disaster and disaster area of different meteorological disasters indicated that the cool summer damage was the major meteorological disaster for rice production in Heilongjiang Province.

Key words: Heilongjiang Province, Heilongjiang Province, Rice, Meteorological disaster, Assessment