Abstract: Research that large range cold dew wind affect late rice growth and yield from 2011 October 4th to October 7th in Yulin City, through the way of field survey and experimental plot . The results showed that, late rice suffers large range disaster with appear time of cold dew wind and the long rainy and sunless weather and manage measure in cold dew wind front and behind have important relations. Experiment results showed that cold dew wind slow down late rice heading speed and reduce late rice seed setting rate.