Result showed that rice of drought seedling and sparse plant could increase yield due to strong stem, long spike and high fertile, and stablize high yield potential, Studlng morphology function of individual developand population struction, anther clarified high yield fandament about rice of drought seedling and sparse plant as follows:1 The foundations which strong stem and big spike were obtained were heavy dry weight per plant, longer upper leaf, thicker basilar internode and more vascular bundle.2 Thicker leaf, longer and erect upper three leaves, shoot layer of high photosynthetic efficiency, thick neck of spike and large section vascular bundle were foundtions which high fertile was obtained.Analysing and comparing growth traits in prophase and anaphase of rice of drought seedling and sparse plant on various soil and climate, three technique types which could be used in the north were put forward.