Abstract: Suitable Sowing is an important factor to play corn yield potential.In this study, the production of corn varieties widely planted as test materials under different sowing of maize,the grain dry matter accumulation dynamics and developmental changes dynamically analyzed under different ecological conditions sowing of different varieties the growth characteristics,focusing on the effects of different sowing dates on maize yield potential.The results showed：under different sowing conditions of maize showed a big difference,with the delayed sowing date,all varieties have shown the duration of each growth period and growth period gradually shortened, shortened 6-8 days.From the dynamic analysis of grain filling,the later sowing date and grain moisture milk line height ratio higher grain filling process slows down,filling rate decreased.Sowing has a significant impact on spring corn yield,which affected a large grain weight,grain weight and yield with delayed sowing date significantly different,and ultimately limit increase production.Suitable planting time Tumochuan plains of Inner Mongolia late April,mid-May after severe cuts,is unfit for planting.