The ecosystem of culturing in shoaly land is an artificial ecosystem. Population size is limited,and there are simple composition of biology. It is easy to be affected. Culturing in the intertidals will not only pollute its own environment,but it will also impact the marine ecosystem biodiversity,and in certain waters it can cause red tide. This paper starts with the biological components in the environment of culturing in the shoaly lands,combines their roles in the ecosystem,and elaborates on the effects on the marine ecosystems.