Abstract: Yields of spring maize in mountainous area and summer maize in plain area were chosen as research objects in this paper for evaluating applicability of WOFOST model in simulating maize yield of Beijing zone.And assessment of maize yield loss caused by agricultural drought in Beijing was carried on based on WOFOST model driven by climate data and statistical yield data.The results showed that,first,index of agreement between simulation value and statistical value from yearbook,of both mountain spring maize and plain summer maize,reached more than 0.9,and average simulation errors were all less than 10%,which indicated that WOFOST was applicable for simulating yield of both mountain spring maize and plain summer maizeSecond,following the system of drought index in this paper,early summer drought had serious impact on spring maize yield,which resulted in yield reduction rate of 15.91% caused by slight early summer drought and 22.99% caused by severe earlysummer drought However,spring drought and dog days drought had slight impact on spring maize,and also early summer drought and dog days drought had slight impact on summer maize,which both resulted in yield reduction rate below 10%.Results of our research provide scientific basis for instructing maize cultivating and drought mitigation.

Key words: WOFOST model, Drought, Yield loss assessment, Agreement index