Abstract: On the basis of studying and generalizing the production experiences of the mass in the last two years, suggestion are made for the rational population structure on different cultivars, different levels of the yield and different stages of growth and development. According to the rule of the yield formation factors, principles for managing plants based on growth vigors and growth features were summarized as follows: 1. Based on the relation of co-extension between tillers and leaf blades of main stems; and based on the period of developing into two extreme directions of tillers, plants were managed, so that adequate tillers and stout seedlings were promoted, this insures a quite high rate of effective tillers that adequate number of ears can be obtained. 2. Based on growth vigors and growth features of the 9th, 10th, 11th leaf blades which emerged near the shooting period, management techniques for promotion and control of the seedlings were determined, so as to decrease floret degeneration and increase seed set. 3. Master the rules of dry matter accumulation in seed of plants with different growth vigors and increasingly manage plants in the latter stage, to prevent excessive vegetative growth and early ageing, so that grain weight can be increased.