Abstract:The constructed wetland has been widely applied in the wastewater treatment in the recent years because of its characteristics such as the obvious environmental benefit, god economic returns and wide application range. As the producer of ecological system, the plant is the most core factor of the wetland system. Based on the study and application of constructed wetland plants at home and abroad, the application of the plants in the tail water constructed wetland, the factor affecting the purification ability of the plant and the problems existing in the wetland plant application are expounded. And the study and application of tail water constructed wetland plant are expected. On the basis of referring a large number of literature, the principle methods, affecting factors and main problems to select the wetland plants are systematically summarized, which provide the basis and reference for the practical engineering application.