Two different geological formations of mountains of ecological sensitive areas around Taihu lake were selected,and 137Cs tracer method was used to analyze the137Cs distribution and soil erosion rules.The results showed that: The137Cs content on the surface of yellow brown soil of sedimentary rocks was more than at the bottom,while the137Cs content in central of rocky body yellow red lava was higher than on the surface and at bottom.Soil erosion variances along body of magma rocky slope were: top of the hill...