Abstract: The online communication for excellent undergraduate graduation design (thesis) of mechanics major in national universities was held by the 2018—2022 teaching guidance committee of mechanics majors in colleges and universities of the Ministry of Education since 2020 and has been successfully held for two sessions. The paper introduces the organizational form, basic situation, characteristics, problems and suggestions of the communication activity, etc. Through the introduction of this paper, the teachers in colleges and universities can know more about the status of some excellent undergraduate graduation designs (thesis) and the two communication activities. Meanwhile, this will provide a beneficial reference for further improving the quality of undergraduate graduation design (thesis) in mechanics majors.