Based on data of wheat grain filling, 1000grain weight, the meteorological obs ervations and weather charts etc., an analysis of the winter wheat growing rate changes in the grain filling is made with the meteorological factors. The result s are as follows:(1)The change of wheat growing rate and 1000grain weight appe ar doublepeak pattern. (2)The chilly disaster is the main factor affecting win ter wheat growth rate in the grain filling. (3)The chilly disaster in 2006 is af fected alternately by three branch of cold air.