Based on the data of temperature and precipitation at 54 meteorological stations in Shaanxi Province from 1961 to 2004

and the calculation for accumulated temperature during winter

influences of thermal and water resources on winter wheat were analyzed. Results indicated that seasonal and annual mean tempera-tures changed obviously in the mid 1980s

decreasing before the mid 1980s

increasing after the mid 1980s

and increasing rapidly after 1990s. Precipitation showed a reducing tendency. Thermal resource increased and the planting area of winter wheat expanded northward after 1980s. Serious drought and water shortage ap-peared in 1990s. The negative impact of climate change on winter wheat was greater than the positive.