This study investigated 21，733 minors aged from 6 to 18 years old，and found that the proportion of Chinese minors with Internet addiction tendency is not high. However，0.9% minors had an Internet addiction score of four，the full mark，indicating relatively addicted；14.78% have some degree of addiction tolerance；and 18.36% have some withdrawal symptoms. The risk of Internet addiction was higher for males，rural minors，students in higher grades and minors who first went online earlier. Online entertainments，such as playing online game，joining fan events，watching live-streaming，short videos and animation/cartoon online，can increase the minors’ Internet addiction scores. However，online learning，such as searching for information，and online leisure，such as chatting，have no significate impact on Internet addiction scores，and may even reduce Internet addiction scores. School integration，life satisfaction，happiness，academic achievement satisfaction and confidence in the future are the protective factors against Internet addiction，while perceived importance of Internet and academic pressure are the risk factors for Internet addiction. The key to preventing minors from becoming addicted to the Internet is to improve the quality of their offline life. The anti-addiction education has a certain role in reducing Internet addiction，which can be considered to be carried out nationwide.