This research investigates the environment impacts of hospital waste pretreatment residues under landfill conditions. Two techniques - incineration and sterilization - to treat hospital waste were taken into concern. The biodegradability of sterilized hospital waste and leaching behavior of hospital waste incineration ash were investigated, as well as co-dispoal hospital waste pretreatment residues with municipal solid waste. With the research results, a novel approach to treat hospital waste pretreatment residues were concluded.