Many ways can leads to heavy metals pollution. And the heavy metals are easy to enrich and cannot be degraded and may cause great effects on environment and organism. Heavy metal pollution is a serious problem that society concerns. Diatom is very sensitive to environment changes and it an monitor the heavy metal pollution on surface water. Previous studies have focused on the planktonic algae, the habitat of benthic algae is totally different from planktonic one. We need to find out what has happened at be...