1. There is not enough time and few opportunities.

During the undergraduate period, there are not many opportunities for students to engage in scientific research-related work. Many students, both freshmen and sophomores, are attending classes, and the real chance to enter the laboratory may be only one year in junior year, and the senior year will have to prepare for postgraduate entrance examination, postgraduate entrance examination and job hunting. So, first of all, undergraduates don't have enough time.

2. Undergraduate scientific research training is not systematic enough to meet the requirements of SCI papers.

SCI's articles are very demanding, especially the format of the articles. Without systematic training, the Chinese manuscript rate is not high. Without sufficient time and systematic scientific research training, it is very difficult for undergraduates to publish SCI.

The main reasons why graduate tutors prefer students who have published papers are as follows.

1, these students have a solid professional foundation and strong practical ability;

2, because of early contact with scientific research, so, you can invest in the tutor's scientific research work faster, and it is easier to produce results.