First of all, you can use some tools such as the minute hourglass to help children prevent Internet addiction. You have to educate your child about virtual networks and online games first. You need to tell teenagers about the dangers of Internet addiction. For some online games you can actively share with your children but make an agreement with them in advance to control their play time. Use an large hour glass timer to help them set the duration of the game. Use a sand clock 60 minutes kid to monitor your child's play time. You also need to give teenagers a rich experience of daily life. It is very important to take an active part in all kinds of beneficial activities and cultivate their own good interests and hobbies for the healthy growth of teenagers and the prevention of Internet addiction.