The mental health of minors is a major social problem，which is not only related to social stability and family harmony，but also related to the future development of the country. Internet use is one of the important factors that affecting the mental health of minors. This study conducts an investigation on the influence of various types of Internet use on mental health. The results show that the different types of Internet use frequency have different effects on mental health which includes both positive and negative aspects. And comparing the high parent-child relationship group and the low parent-child relationship group，the effects of Internet use are different. The suggestions about minors’ Internet use are proposed based on these results.