Abstract: In order to maximize the yield potential of corn, the test is based on country (Suzhou) Corn Experiment Station unified layout, make the Huaibei region Varieties of corn Zhengdan 958 and 108 Nongda size, weight, moisture and speed changes of grouting trial study. The results showed that: In the 45 days before pollination wet grain size increased rapidly to 55-60 days of filling wetlands the size of the largest Tatsu; two species of stem volume with the conduct of grouting has been on the increase both wet and dry bulk reaction than Nongda 108 Zhengdan 958 grain storage capacity and great potential. Zhengdan 958 weight 50 days before grouting to increase faster, Nongda 108 grouting 55 days before the rapid increase in weight, after the increase in slow, 60 days no further increase in pollination. Two species of 30-35 days before grouting moisture less 35 days after filling the water began to decline rapidly. 30-35 days of pollination two species the fastest filling rate, grain weight by up to date more than 9 grams; 40-45 days after pollination filling rate decreased rapidly and increasingly weak; while reflecting Nongda108 than Zhengdan 958 filling rate relative lag, so Nongda 108 harvest period but also later. To sum up, Zhengdan 958 early-maturing varieties such as pollination in flowering about 55 days the best harvest, that is, by the end of September to early October harvest, on the late-maturing varieties such as Nongda 108, pollination flowering about 60 days after harvest the most well, that is harvested in early October, a variety of indicators and be able to maximize effectiveness.