[Objective] The relationship between Cd morphologic transformation and bioorganic fertilizer application in paddy soil and the accumulation and distribution characteristics of Cd in rice plant were analyzed in order to provide an economical, safe, and a scientific basis for rice production in polluted areas.[Methods] A two-year field experiment for the red paddy soil was conducted in Changsha City, which was situated in the Hu'nan Province. The soil and rice samples were collected from five disposals (0,10,20,30 and 40 t/hm²) in their maturation period. The morphologic change, distribution of Cd in rice, and continuous influence of bioorganic fertilizer were analyzed.[Results] ①The application of bioorganic fertilizer can change the acid-soluble Cd into its reducible form in the soil, thus reducing the accumulation of Cd in rice and transferring the coefficients of the soil-root and stem-grain. ②On employing a high concentration of a bioorganic fertilizer, the concentration of acid-soluble Cd was significantly reduced in 2017 and 2018; the maximum range of decrease was observed by 22.42% and 7.05%, respectively. The amount of Cd in different parts of the rice was observed to vary in the following order:roots > stems > leaves > grains. ③The bioorganic fertilizer had an impact on the Cd content in the rice grains by regulating the factors (pH value, soil organic matter, and cation exchange capacity) that affect the acid-soluble Cd.[Conclusion] The application of bio-organic fertilizer can facilitate an improvement in the soil fertility and rice yields by reducing the biological availability of acid-soluble Cd in Cd-polluted paddy fields. In conclusion, when the applied amount was 30 t/hm², the straw bioorganic fertilizer with an organic matter of 255.32 mg/kg could play a better repairing role.