Abstract: In order to explore the characteristics of biological yield of adzuki beans under rainfed conditions of accumulation and to provide the reference for the economic cropping adzuki beans, the study was carried out adzuki beans in rain fed on growth conditions by ‘Jinxiaodou 2’in 2012. Field sampling was began to collected data after seedling emergence in the 20 days, once a week. Then, studied the rules of ‘Jinxiaodou 2’ under rained conditions in the whole period of biomass variation by the data. The results showed that: ‘Jinxiaodou 2’ height growth and growth days showed a linear relationship, the correlation equation was: y=12.097x-4.863, degree of fitting was 0.8371; after seeding emergence, the opposite really leaves continued growth of in 30 days, then declined to died away in 50 days. Biomass accumulation of ternately compound leaf showed parabola, dry and fresh weight of biological accumulation in accordance with y=-2.5229x2+48.458x-87.103 and y=-0.3822x2+7.8570x-14.878 function distribution. The growth of stems was same as ternately compound leaves and biological water holding capacity was lower than leave. Growth performance of roots was first quick, then slow, after August, the roots showed serrated change smoothly, the soil and conditions improved development effect on the root of the larger. The stems related with variety and was a relatively stable traits. The joint showed growing phenomenon when rain was plenty, but the biomass increase was mainly due to distance between joints. Controlling plant type and can be carried out in 50 days after emergence around. Blossoms fell off badly, blossoms appeared and become effective pod spent were the beginning of autumn, the filling time lasted about 40 days. For that reason: ‘Jinxiaodou 2’ can choose the suitable late sowing; rainfall year pay attention to prevent the plant growth, the early focus on protecting blossom bud keeping, to ensure a good harvest.