The student affairs in American universities are analyzed in according to the thought of systematic, balance and connection. Its careful management and overall service of environment, professional and homization of conversation between teachers and students, education diversification and master select of interactive system demonstrate that individual overall development and overall education model. It inspires ecology of education that a mapping is constructed between the subject and environments. A path must be constructed from single subject to overall ecology, from the specific rules to abstract thinking, that is, optimizing students’ ecology places, gathering education diversification, activating system and building freedom, equality and catholicity atmosphere.