Abstract: In this study, we summarized the experiments and practical application for the Effective microorganism (EM) reagent in livestock and poultry raising, crop planting, aquaculture and environment improving, and expounded its function on agriculture clean production, environment protection, improvement of yield and quality in agricultural production, enhancement of growth and development of livestock and poultry, resourceful and harmless treatment of agricultural wastes, protection and resilience of agricultural ecological environment, and so on.