Abstract: By taking regional climate system modeling as the research prototype，this paper investigates the key problems of building Geophysical Collaborative Computing Environment（GeoCoEn） based on distributed Web environment by using Peer-to-Peer and mobile agent technology.A multi-layer architecture，including application layer，management layer，execution layer and supporting layer，is designed to support openness，flexibility，extensibility，portability，transparence and other abilities required by collaborative scientific computing environment by integrating P2P and Multi-Agent System（MAS）.