At present, China and even the whole world have been seriously affected by the epidemic, and the teaching process of students has been greatly reduced. In order to stop the spread of the epidemic on campus and prevent the life, health and safety of teachers and students from being threatened, at present, online teaching is implemented in China to achieve the purpose of stopping classes. Taking nail platform network teaching as an example, this paper briefly expounds how teachers should change their roles and use network teaching platform to change teaching mode under the development of special epidemic situation.

An excellent teacher can teach tens of thousands of students online at the same time, which can not only solve the problem of lack of excellent members in the teaching team, but also ensure the learning efficiency of students.

First, the impact of special epidemic on the education industry

Many industries have suffered great losses since the outbreak of the epidemic. The education industry is the focus of cultivating the future hope of the motherland. This epidemic has seriously affected the education process of students and completely disrupted the spring education plan. The Ministry of Education has repeatedly issued notices to extend students' holidays, which shows the seriousness of the epidemic. The SARS incident in 2003 caused panic around the world, and students were suspended for one month, especially those facing the college entrance examination that year. In just 30 days, the number of confirmed cases is more than 10 times that of SARS, which is enough to prove the seriousness of the epidemic. The education of students is urgent. Major online education platforms have announced free classes during the epidemic, which can greatly reduce the impact of suspension on students' education.

Teacher's role transformation under special epidemic situation

First of all, under the special epidemic situation, teachers are the "supporters" in the field of education and teaching in China, and undertake the heavy responsibility of education and teaching in the first half of 2020. They are also "learners" and "practitioners" of information literacy. In order to ensure that the progress of education and teaching is not affected by the epidemic, teachers need to use online classroom live broadcast software and apply information technology to carry out online teaching, so as to achieve continuous follow-up of teaching objectives and not have a negative impact on students' future development and study. Secondly, under the special epidemic situation, teachers are "management innovators" and the information-based teaching mode covers a wide range. Based on teaching, it is mainly reflected in teachers' self-evaluation, teaching method evaluation and teaching efficiency evaluation. In teaching evaluation, teachers need to master the evaluation process of information-based teaching mode, change the previous offline evaluation method, and make clear students' academic performance and learning efficiency under the network teaching mode by giving full play to the functions of various live and online classroom software. Finally, under the special epidemic situation, teachers are "innovators" of the new teacher-student relationship.

Under the special epidemic situation, teachers bear a heavy burden of education and teaching. Although teaching conditions and actual conditions restrict teachers from carrying out education and teaching work, teachers shoulder the hope project of the motherland through the transformation of the above roles. By renewing their own teaching ideas and optimizing the teaching mode, they not only ensure the teaching progress, but also implement the development goal of educational informatization. During the epidemic, teachers turned around gorgeously, continued to show their great love for teachers' morality, and carried out teaching activities based on network means according to local conditions. At the same time, mastering and warning students' physical health during the epidemic period is the primary task of daily home-school interaction, and teachers' concern for students and their parents when they become "parents" of class groups is the embodiment of teachers' great love for teachers' morality during the special epidemic period.

Third, a brief introduction to nail classroom teaching