Abstract: In order to reveal the law of climate change in Suzhou, use scientifically the agro-climatic resources , and promote the high and stable yield of winter wheat, based on yield of winter wheat and climate date from 1954 to 2008, climate change and the impacts on yield of winter wheat were analyzed in Suzhou. The results showed that, the average annual temperature had fluctuantly increased, the change rate was 0.36℃ per 10 years, the time of temperature change suddenly was 1994, the accumulative temperature above 10℃ increased by 94.7℃ per 10 years. The average annual precipitation was 880.5 mm. The duration of sunshine had fluctuantly decreased, the change rate was -52 per 10 years. The climate yield of winter wheat was “w” curve, it was lower from 1960 to 1969 and higher in later 2000, the lowest year was 1998, and the climate yield was positive later 1998.