The vigorous development of quantum information has prompted people to examine and solve fundamental problems in quantum mechanics from the perspective of information,and remarkable achievements have been made.Based on the perspective of quantum information,many ontological prob-lems in quantum mechanics have been given a new interpretation.Firstly,the definition of information is essentially an epistemological issue.Secondly,although quantum information has provided many inspiring ideas,the gap between information and matter remains unexplained.Finally,some fundamental ontological problems in quantum mechanics have been further clarified from the perspective of information.