In this activity, all departments cooperated closely and completed the activity well. In the early stage of publicity work, through the way of saving for small gifts, we selected "two plus two" as the theme to adapt to the current hot spot of xjtlu students, and gave students some suggestions and study abroad experience, which attracted many students' participation. The activity process is roughly divided into three parts: early problem collection, student discussion and QA, and tutor sharing. During the activity, the students actively expressed their views and put forward their own questions, such as "the advantages and disadvantages of two plus two", "the current epidemic situation, whether two plus two is worth it" and so on. At the same time, our invited tutors and seniors also gave their own opinions and opinions, and told a lot of personal experience. The activity adheres to an open way, so that every student has the opportunity to speak. Through this activity, each student learned a lot about the knowledge of "two plus two under the epidemic situation", and answered their puzzles.