Abstract: Based on the review on the integrated effects of different kinds of factors which affected the freeze injury of winter wheat,a simple empirical freeze injury forecast system for winter wheat in Beijing was established by using decision tree method.The system was divided into five levels including variety,sowing date,conditions before wintering,conditions during wintering and conditions in the early spring.The degree of cold-hardiness,frostbite and freeze injury were assessed and predicted at the five levels by the chosen indexes including the internal factors,such as variety,sowing conditions and growth status,and external factors,such as soil and meteorological conditions and management practices.The recommendations and remedial measures to prevent and reduce the winter wheat damage from the freeze injury during different growing stages in Beijing area were put forward,based on the predicted freeze injury grades.

Key words: Winter wheat, Winter wheat, Freeze injury, Forecast system, Decision tree method