Although the amount of municipal solid waste landfill treatment in various countries around the world continues to decline, landfill has always been an indispensable and ultimate guarantee for the disposal of urban solid waste. In addition, the long-term operation and maintenance process of early municipal solid waste landfills inevitably brought varying degrees of pollution to the surrounding surface water, soil, atmosphere, and groundwater. The ecological restoration of landfill sites has become an important task in environmental protection, which is an important way to reduce or even eliminate environmental damage and public health threats, as well as effectively improve the living environment. This sub forum aims to exchange and share cutting-edge innovative achievements such as new theories, technologies, equipment, and practices for ecological restoration of various municipal solid waste landfills, explore solutions to new problems such as sustainable landfills and emerging pollutant treatment under the background of the " Carbon peaking and carbon neutrality" goal and the creation of a "waste free city", and promote the healthy development of the industry.