Abstract: one of the important problems for the self-learning system is to control the student’s learning path and to know the student’s learning knowledge state in the system. The paper studies learning state space based on knowledge space theory and the learning state model based on Petri net is introduced. All possible learning paths in the learning state space and student’s learning state can be attained based on Petri net technique. In the model, learner can control freely the learning path through transition of Petri net. The system can know learner’s learning state by the mean of the place marking of Petri net. The aim of the personalized learning path can be achieved by the model.