Abstract: The temperature and the precipitation had been increasing, but the duration of sunshine decreasing in the cotton production regions in Xingjiang in the past 50 years.The impacts of climate change on cotton are studied with the COPRAS model.The results showed that the climate change had a positive impact on the growth and yield of cotton during the last 50 years.The date of the flowering and open boll period of cotton was earlier and the growing period was delayed obviously.The whole growing season of cotton was delayed for 8.2, 2.4 and 5.2 days in the 1970s, 1980s and 1990s than that in the 1960s respectively.The cotton yields had increased 15.7 kg/ha per ten years.The yield fluctuation of the cotton increased at the same time.That means that the risk of climate change for the cotton yields had increased.

Key words: Climate change, Climate change, COPRAS model, Cotton