Abstract: This study aims at obtaining suitable sowing date of maize in Harbin area, and promoting agricultural production of maize. Main maize cultivar‘Hongyu29’in Harbin, Heilongjiang Province was used as test material and three sowing date treatments (T1 was April 25th, T2 was May 6th, T3 was May 11th) were set, the variation rules of growth and yield were studied. The results showed that the growth period of maize under T1 and T2 treatment was prolonged, the dry matter accumulation and allocation, and the growth rate under T1 and T2 treatment were significantly higher than those under T3 treatment from tasseling stage to mature stage, the dry matter accumulation and transferring to grain increased, the yield of T1 and T2 treatment increased by 435.1 kg/hm2 and 1621.9 kg/hm2, respectively, T2 was the optimal in the three treatment, its utilization degrees of soil water and heat were higher. The suitable sowing date could make full use of climate resource such as air temperature, sun light and soil water, prolong the growth period, improve the growth and development of maize, increase the dry matter accumulation and allocation in grain, and raise the maize yield. The suitable sowing date of maize is from May 4th to May 6th in Harbin area, but the soil moisture or the first saturating rain in spring should be considered for the suitable sowing date.