HowNet individuals can check their weight 3- 10 times. However, the specific frequency limit may vary according to the school's ordering situation. In addition, if it is the duplicate checking system of HowNet, it is the most authoritative paper detection system, with the widest duplicate checking database and very accurate duplicate checking effect on all kinds of papers. Moreover, some universities and periodical institutions in the society will choose to cooperate with China HowNet duplicate checking system. For these partners, HowNet duplicate checking system will provide a certain number of free duplicate checking times, and each university graduate who has a cooperative relationship with HowNet duplicate checking system will have 1-2 duplicate checking times. There is a limit to the number of duplicate checks in these universities, but the division of the number of times is decided by the universities themselves.