Abstract: In this paper, the technological characteristics of livestock excrement treatment systems employed in three projects developed by them are analyzed. They put forward a comprehensive technology system about livestock excrement treatment and the complex fertilizer producing technology by residue and effluent from the anaerobic digester. Compared with the technologies of solid-liquid separation, anaerobic digestion and aeration, it is necessary to combine excrement treatment with sustainable agricultural development and agricultural ecological circulation as to form a comprehensive systematical engineering of excrement treatment and utilization, and to reach a high unity of economic, social and ecological benefits.