Five rice varieties were planted to determine the variation of agronomic traits in five different regions in a cold area of northeast China based on a different day of rice heading and variation co-efficient of yield, rice varieties were divided into three types: insensitive, middle and sensitive; the number of grain panicle and the number of grain per panicle exhibited quadratic curves as a function of AT difference; no obvious relation was seen between 1 000-grain mass and AT difference; the sterility rate of all the five grains increased obviously at lower ATZs; the chalky rate and the chalkiness degree had minimum values and the head-milled rice had maximum value at the optimum AT; because protein content, amylose content and taste score showed no relation with AT
difference, temperature had not any impacts on these factors.