The feeding, burrowing, and reworking of benthic invertebrates, collectively termed bioturbation. Bioturbation is one of most important ecological processes, which can cause the redistribution of particles and interstitial water in sediments, and therefore have significant affects on the physical, chemical and biological properties of the sediment. In particular, bioturbation redistribute particles and porewater in sediment and thereby increase the surface area available for sediment-water interface exchange of nutrients and contaminants, resulting in significant changes on the sorption characteristics of the sediment. Hence, the environmental behavior of contaminant in sediment was significantly influenced by the bioturbation. For the nitrogen, bioturbation can impact it's biogeochemistry in two routes. One is that bioturbation can stimulate the solute exchanges (oxygen and metabolites) across the water-sediment interface and then enhance the microbial processes such as nitrification and denitrification. The other is that bioturbation can enhance the exposed area of sediment to water and air, thus accelerated the exchange of nitrogen at the sediment-water interface. For the phosphorus, the bioturbation have significantly effect on it's biogeochemical cycling, including the increase of the release of soluble reactive phosphorus (SRP) from sediment to water and alteration the chemical form of phosphorus. Furthermore, the degradation of organic phosphorus was enhanced by bioturbation. For heavy metals, bioturbation can alter the environmental behavior of metals in sediment in several ways. The first way is that the spatial heterogeneity of sedimentary metal levels was influenced by the bioturbation. The second way is that the bioturbation lead to a significant flux of metals to water. The third way is that the bioturbation can affect the chemical form of heavy metals. For the hydrophobic organic contaminants (HOCs), the release, bioaccumulation and biodegradation of them were significantly affected by the bioturbation. On one hand, bioturbation can lead to a significant increase flux of HOCs to water. On the other hands, bioturbation can enhance the benthos bioaccumulation the HOCs. Addition, due to bioturbation has been confirmed to increase the abundance of microorganisms and the oxygen in the sediment, thus the biodegradation of HOCs were enhanced.