Abstract. This paper describes how to introduce the mechanism of knowledge innovation into online learning community (OLC) and constructs a model which can facilitate innovative knowledge and develop online learner's ability of knowledge innovation. The model is represented by three levels, namely: individual, collaborative and intermediary level, which is based on theories of knowledge creation and management, cognitive and social constructivism. Individual knowledge innovation begins with internalization, via combination, externalization and socialization, which is different from Nonaka's SECI. In collaborative knowledge innovation, learners in OLC share, compare, negotiate, create and integrate knowledge together. Individual knowledge innovation and collaborative knowledge innovation need certain intermediary. In doing so, individual knowledge applied to OLC situation can produce, promote and create new knowledge of OLC.