In order to reveal the influence of organic acid exudation from root on phytoremediation effects, a pot experiment was carried out to investigate the effects of Glomus geosporum (G.g), Glomus mosseae(G.m), Glomus versiforme (G.v), Glomus etunicatum (G.e) and Glomus diaphanum (G.d) on organic acid exudation and137Cs uptake by sorghum haipense. Besides, the regression curves between organic acid contents and 137Cs specific activity in different organic tissues were established by stepwise regression analysis. The results showed that the kinds of organic acids which were exuded by the symbiotic root systems with arbuscular mycorrhizal fungi (AMF) inoculation were less than control. Furthermore, inoculation with G.g, G.m, G.v and G.d also decreased the contents of organic acid secretion of sorghum haipense root. The max size of fall in total organic acid was 67.37μg·(cm-2·3h-1) and it was found in inoculation with G.m. Inoculation with G.m, G.e and G.d could significantly improve the137Cs specific activity in different organic tissue (root, leaf and stem) of sorghum haipense, which indicated G.m, G.e and G.d would enhance the enrichment of137Cs in host plant. The negative correlation between organic acid contents and specific activity of 137Cs in different organic tissue were found by correlation analysis. In a considerable degree, maybe oxalic acid is one of main inhibitory factors during the enrichment of137Cs in host plant. It is suggested that agronomic measures to reduce the oxalic acid content of rhizosphere domain is the better way for plants enriching137Cs from soil.