Ignoring moral education: the interactive subject, open content and nonlinear process of distance education communication are helpful for learning knowledge and skills, but moral education with will and action as the highest form cannot be completed by computers, because computers are machines, not people, and moral education cannot be carried out. Lack of personality demonstration: "learn to be a teacher and behave in the world", education is to a great extent a process of edification and infection. Although distance education can use technology to create intuitive learning scenes, it lacks physical and intuitive teacher personality demonstration. Lack of emotional infection: Similarly, it is difficult for computers to complete emotional education for students. Students' emotions under the network communication are prone to the phenomenon of hot man-machine relationship and cold interpersonal relationship, lack of friendship and strong loneliness, which affects their emotional and emotional development. Easy to mislead attention: the openness, process nonlinearity and concealment of online content make it difficult to effectively regulate online communication behavior, deviate from teaching objectives, distract students' attention and relax their attention to current learning content.