Through researching construction principle, system framework and operation mechanism of digital lifelong learning platform, constructing such a platform needs include the following functions: first, digital lifelong learning platform is able to provide convenient, flexible and personalized learning environment for the learners; second, it achieve the lifelong learning overpass of vertical join and horizontal communication for all types of education; third, it provides learners with learning information stored, credit recognition and conversion, learning credit management, and obtains mutual recognition of learning outcomes convergence "Credit Bank"; it can provide technological support for comprehensively promoting continuing education and lifelong education system and building the learning society.