This paper analyzed the development pattern changes of China’s agricultural & forestry universities and colleges in three different stages:before 1949,from 1949 till 1978 and after 1978..The results show that two patterns called “independence-merger/independence” model and “comprehensiveness-comprehensiveness” model were followed by China’s agricultural & forestry universities before 1949,there was only one pattern called “independence-independence” model from 1949 till 1978; and there were two patterns called “independence-comprehensiveness” model and “comprehensiveness-independence” model since 1978.Different patterns in different eras and for different universities are co-determined basically by three factors:social-economic development; changes of national policies,and universities' self-development capacities.