Abstract: Based on the data of yields of early spring crops in 1972-2004 and of ten meteorological factors which had the optimum gray relevancy with the crop yield in Yunnan Province,the Grey Prediction Model GM(0,N) was established by using raw data and residual error series,and the trend yield of early spring crops was predicted.The results showed that the verified grey prediction model GM(0,N) was suitable for prediction of the trend yields.The forecast results had certain reference value.

Key words: Grey prediction model GM(0, Grey prediction model GM(0, N), Yield trend forecast, Accuracy test, Trend assessment