Soil types have important influence on the biomediation of Cs contaminated soil.In order to investigate how soil types affect the absorption and transfer of Cs in Gynura cusimbua (D.Don) S.Moore,we cultivated G.cusimbua in four types of soils which are Purplish,Paddy,Red and Yellow from Sichuan Province,respectively,and then soils were treated with different concentrations of CsCl (0,20,40,80,120 mg·kg^-1) after three-leaf stage.The Cs content in roots,stems and leaves were analyzed after 10,20 and 30 d,to explore the possible correlations between the bio-enrichment of Cs,soil pH value and soil bio-available potassium.The results showed that:(1)in four types of soils,Cs content was significantly positively correlated with the treatment concentration and time,and there were obviously differences in G.cusimbua among the different organs,and the order of Cs content from high to low was roots,leaves and stems,which mean that the organs of G.cusimbua had accumulation ability of Cs.(2)In different soils,the bio-enrichment coefficient and transfer factor of G.cusimbua were quite different at each treatment stage.The G.cusimbua’s abilities of bio-enrichment and transfer increased at low concentration before 20d,and then decreased.Meanwhile,in the four soils,G.cusimbua’s bio-enrichment of down-ground parts outweighed its up-ground parts,and plant had the highest accumulation of Cs in Yellow soil.(3)There were some correlations among the bio-available potassium,soil pH value and cesium accumulation of G.cusimbua.Compared with other three soils,G.cusimbua had the highest Cs accumulation in Yellow soil because of its natural soil pH value and low concentration of bio-available potassium.