Abstract: In order to promote maize new varieties rapidly in the most suitable area, we analyzed the results of Shanxi Province maize regional trial in 2011 from different angles with the methods of investigating the yield of these test point with varieties increasing production or increasing yield more than 5%. Such as in the late-maturing areas (4200 density group), there was no variety with an average yield more than 5% at each test point. We statistic only the varieties with increasing yield more than 5% at each test point. The proportion of point with increasing yield was 100%. Such as in the late-maturing preliminary test (3500 density group), the proportion of the tested varieties with average yield more than 5% at each test point was 19.4%, but the proportion of the test point with increasing yield was 69.4%. The results showed that, the number of authorized varieties increase and the promoting area of every variety shrink. It would raise our country maize yield on a large scale. This requires of maize regional trial system of China at present might be reformed and give new ideas for new varieties promotion or change the statistical way of regional trial yield. We also could learn from foreign variety registration system, carrying out variety registration system and variety's sales margin system. It will help to encourage and urge enterprises to ensure that the varieties they sale had the productivity and adaptability in production, to make the maize industry of China develop excellently.