Polythene and plastic waste accumulating in the environment are posing an ever increasing ecological threat. Biodegradable plastics are environment friendly; they have an expanding range of potential application and are driven by the growing use of plastics in packaging. In this study, soil sample were collected from polythene and plastic dumped site waste in the area of Muthupet Mangrove. The physico-chemical parameters of the soil were studied. The isolated microbial strains were identified based on their cultural morphological and biochemical study. Degradation of polythene bag and plastic cup were analyzed 35, 45 and 55days of incubation in liquid culture method. Pot culture of Vigna radiata was performed. The morphological parameters such as Germinating ability, root length, shoot length and chlorophyll content were analyzed. Waste management was the important process to protect the environment from pollution. Polythene and plastic cup waste materials cause serious environment problems, so the waste materials removed by using the microorganism. This method was cheap and effective, so that it can be used widely for the treatment of polythene and plastic cup.