The municipal solid waste landfill leachate is a highly toxic wastewater due to its refractory contaminates which pollutes ground water as well as surrounding environment.. The treatment method of landfill leachate was optimizing to improve the efficiency using integrated anaerobic digestion and membrane process. As the landfill leachate is difficult to treat due to is refractory contaminants and volume along with its changing characteristic with time the treatment becomes difficult, studies on anaerobic digestion of the leachate were carried out along with methane gas generation in order to enhance treatment efficiency membrane technology was coupled with anaerobic digestion. Fresh leachate were generated and characterized which is then feed to anaerobic reactor. Effluent from the anaerobic reactor was tested and was found to remove COD up to 90% and reduction in total solids, sodium, sulphate, phosphate, nitrate and heavy metals. (like Zn, Pb, Cd, Ni, Co, Mn, Fe, Cr, Cu etc.)However the efficiency after anaerobic digestion was not meeting the Environmental Standards. Hence it was subjected to ultrafiltration. (UF) The permeate of UF was feed to reverse osmosis (RO) membrane and permeate of RO was characterized for various operating and performing parameters. The combination of UF and RO technology removes COD by 98% and also removes heavy metals. It is found that quality of permeate of RO meets the standard limits set by Government of India.