Most heavy metals in soil with characteristics of stable,accumulative and hard to remove may do harm to human beings through food chain.Cadmium and lead have been the research priorities and hot spots for their strongest toxicity and widest distribution respectively.Most plants for phytoremediation found at present are not perfect for their low biomass and single action objects.In this paper,the phytoremediation technology type,principle characteristics are reviewed and compared with modern biotechnologies such as molecular biology,and new thoughts are proposed to enhance the plant biomass and...