Abstract: Taking family farm in Longxi County of Gansu Province as research main body，evaluation system based on economic benefit，social benefit，ecological benefit and scientific and technological benefit was constructed，entropy method was used to evaluate its benefits.Results showed that，in comprehensive benefit ranking，economic benefit was the strongest and ecological benefit was the weakest.The more optimized the factors such as education，business model and socialized service，the higher the comprehensive benefit.In economic benefit，cost utilization rate and labor productivity score were higher and benefit was better，but land output rate and commodity rate of agricultural products were lower，and problems of capital，labor and land were main factors that affect its benefit.In social benefit，social contribution and regional demonstration were better，but degree of connection between number of households and other main interests，customer satisfaction was not enough，brand effect and sales channels were main factors to restrain improvement of its efficiency.Among ecological benefits，organic utilization of agricultural wastes was better，but benefit was not obvious in water-saving irrigation and green，organic and pollution-free products.Accordingly，it was proposed to strengthen training of farmers，improve credit service，change business model，implement brand strategy and other ways to break through bottleneck of development and promote development of family farms in Longxi County.