Model of pig-methane-fruits is a new means of soil and water conservation,which uses the small watershed as a unit,methane as a link, and combines breeding industry,rural energy construction with plant industry as a material circle system.The model is of great significance to preventing soil and water loss,improving eco-environment,providing rural energy,constructing eco-agriculture,developing small watershed economy,solving the three problems concerning agriculture,rural areas and peasants.The article explains the main technical principles of pig-methane-fruits ecological-management model,summarizes and analyzes the main measures and benefits of the model in Hezibei and Baishuyuan watershed.