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The constructed wetland has the powerful purification sewage function, the plant is the core of the constructed wetland, playing the vital role in the water body decontamination restoration process. The common plant species in constructed wetland were summarized and classified (floating plants, floating plants, emergent plants, submerged plants, ornamental plants and economical plants). The factors and basic principles that need to be considered when configuring a variety of plants in a constructed wetland combination for decontamination are described, including decontamination purification capacity, environmental adaptability, and the economic and ornamental value of multiple plants, etc. The current research contents and directions are emphatically reviewed, focusing on the functions and efficacy of nitrogen and phosphorus removal and purification of heavy metal wastewater by various plant combinations in constructed wetlands. It is pointed out that there are many shortcomings in the research of decontamination process of many plants, such as imperfect planting standards, lacking of research on the mechanism of decontamination among various plants, between various plants and substrates, and root microorganisms. Many kinds of plants have not been dealt with properly after harvesting, resulting in waste of resources and secondary pollution and other problems. Therefore, in the future research on the purification and restoration of various plant waters in constructed wetlands, a universally applicable planting specification for various plants in constructed wetlands should be formulated; exploring and analyzing how various plants and various plants interact with substrates and root microorganisms function to achieve water purification and repair effects; In addition, fuel ethanol technology, Biogas fermentation and biomass solid fuel technology should be developed to realize the resource reuse of wetland plants and improve the purification efficiency of wetland plants.