Paper duplication checking is a necessary procedure before publication, mainly to detect the repetition rate of papers and published papers, thus prohibiting academic misconduct. Generally, papers with repetition rate above 30% are unqualified, and papers with repetition rate below 30% are qualified.
According to the different requirements of some schools or institutions, the duplicate checking rate of papers is also different. For example, master's dissertations, doctoral dissertations and some authoritative journals have very strict requirements on the duplicate checking rate, and some even require 10%.
First of all, you need to distinguish whether you are an undergraduate thesis or a master thesis, a liberal arts student or a science student. If you are a master of science student, then according to the standards of most universities in China, 10% is just a dividing line (equal to or lower than 10% is qualified, and vice versa).
If you are a master's liberal arts student, because there are too many theoretical knowledge of liberal arts papers, and most of the theories are included in the database of the duplicate checking system, the duplicate checking standard of master's liberal arts will be higher than that of science, generally taking 25% as the dividing line. Therefore, in this case, the repetition rate is lower than 10% or better.
Excluding the above two situations, if you are an undergraduate, as we all know, due to the lack of scientific research experience, most of the papers are pieced together, with many manuscripts extracted and many references cited. Therefore, the standard for undergraduate students is relatively broad, generally around 30%. So in view of this summary, the repetition rate below 10% is still excellent.
The above assumption is based on what you said that the repetition rate is the result of duplicate checking through HowNet, because there are many duplicate checking systems in the market, and most universities in China also use HowNet as a testing system.