Effects of sowing date on the growth and development progress and yield of different rice varieties werediscussed to provide the scientific theoretical basis for selecting appropriate sowing dates for rice varieties of JilinProvince. The mid-early maturing variety Changbai 25 and the mid-late maturing variety Jijing 88 were used as testmaterials. By setting five sowing periods, the growth performance, yield and dry matter accumulation of rice werestudied. The results showed that with the delay of sowing date, the effective tillering critical periods of Changbai 25 and Jijing 88 were both delayed. The growth periods were shortened, the plant height and the above-ground dry mat-ter decreased, and the yield reduced. And for the late-maturing variety Jijing 88, the impact was more significant.The shortened ranges of the growth period of two varieties were as follows: as the sowing date delayed for 7 d, Chang-bai 25 decreased with an average of 5 to 6 d, Jijing 88 decreased with an average of 6 to 7 d. There were significantdifferences between effects of sowing dates on the yield components of two varieties. The effect of Changbai 25 was:number of grains per panicle ＞ numbers of panicle ＞ seed setting rate ＞ 1000-grain weight; while that of Jijing 88was: seed setting rate ＞ numbers of panicle ＞ 1000-grain weight ＞ number of grains per panicle.