The stability analysis of waste slopes is very important in landfill plan and design. This paper introduces some subjects for waste slopes including failure types, strength properties, methods of stability analysis, and special considerations. Additionally, in order to show how to choose related parameters in stability analysis, two cases of failure landfill sites are analyzed. Some influence factors on waste-landfills stability are discussed as well. It is hoped that this content will aid the stability analysis of waste slope during all stages of design, operation and closure of landfill sites.