Active ingredients of seed coating agents were selected according to the characteristics of maizeplanting pattern and the occurrence rules of diseases and insect pests and weather featuring in different areas inNortheast of China. The aim was to control corn diseases and insect pests effectively. On the other hand, seed coat-ing agents is required to be safe in use, having good slow release agent, precision employing pesticide and easy oper-ation in the future. At the same time, it must be adapted to the development of market trends.