Based on survey data from 510 rural households in Weicheng district of Xianyang city，Yangling town，Wugong county of Shaanxi Province，this paper uses Logistic model to positively analyze affecting factors of contract agriculture participated by rural households.The result shows that breeding scales and technical supports have significant positive effects ,while age of head of households，educational background，the number of labor forces，breeding time，breach of the buyers and serious diseases have negative effects on contract agriculture by rural households.Therefore，this paper presents some policy recommendations on how to promote the development of contract agriculture: vigorously push forward mass production of rural households，strengthen the policy support for contract agriculture and improve agricultural participation rate; innovate industrialization connection mode，regulate the format of agricultural contract and optimize trading environment; strengthen technological service and improve the technical guidance to farmers; develop agricultural insurance and decrease or avoid risk of contract agriculture.