In the present paper,the dynamic change rule of manganese content in different organs during seed maturation process and corresponding seed germination rate of Phytolacca americana were compared under different manganese concentrations(0.005,0.1,1.0 mmol/L)in order to understand the manganese enrichment regularity and its effect on reproductive capacity of the manganese hyperaccumulator in breeding period.Results showed that,during seed maturation process,(1)Manganese content in roots,stems,leaves and fruits all increased gradually in each group,and the higher the manganese concentration in nutrient solution,the more manganese content in all organs.Manganese content in seed changed differently between control and treating groups,it declined slightly firstly then kept increasing in control group(0.005 mmol/L)while increased firstly then decreased in final stage in treating groups(0.1 and 1.0 mmol/L).(2)Manganese content order in different organs was seedP<0.01).Results indicate that,Phytolacca americana will distribute the surplus manganese in organs reasonably to reduce the harmful effects caused by manganese enrichment and complete its life cycle successfully.It might improve the germination rate by reducing the manganese amount in seeds at the final stage of seed maturation process to ensure a high reproductive capacity and the soluble water environment and these organic acids in fruit juice may play an important role in manganese toxicity resistance.