Geo-collaboration is a typical feature of virtual geographic environments(VGEs),but there is not a systemic method to bridge the gap between participants and VGEs platform for design,management and implement group collaboration with VGEs.This paper presents a novel method based on a new constructed role model.The role model has six components which are role playing,role authority, role awareness,role thinking,role behaviors,and role representation.Based on the role model, geo-collaboration methodology is presented form multi-aspects including a three-tier architecture designed, geo-collaboration plan,conflict detection and solving.Based on above achievements,aprototype is build which is a case to simulate interaction between human behaviors and global change by integrating the role model and collaborative virtual geographic environment.The result shows that the role model based geo-collaboration for VGEs is reasonable,which is valuable for further research on collaboratively dealing with complex geo-phenomena and geo-processes with VGEs.