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Grid portal is the point of access to a grid system, it provides a friendly portal interface for grid users. Most computing grid uses grid portal to facilitate scientists to access computing resources through job submission, job monitoring, file transferring and so on. And information grid portal is to seamlessly get information for grid users, since information grid is a system that utilizes grid technology to implement information sharing, information management and providing information services. University digital museum grid (UDMGrid) is a typical system of information grid, whose portal is to seamlessly access digital specimens by a one-stop information service. With the developments of information grid, semantic Web and portal model, this paper presents a multilayer portal model for information grid. This model is composed of multiple layers, which include grid resource layer, grid service layer, portlet service layer, portlet layer, application service layer and user layer. The application and experiment of this multilayer portal model in UDMGrid demonstrate its usability, maintainability and expansibility.