Minors face many risks on the internet such as harmful information， addiction， and privacy intrusion. The prevention of these harms has become a global issue. Establishing a regulatory system is the basic form of protection. There are three approaches of regulation in the protection of minors online： self-regulation， exemplified by the United States； governmental regulation， exemplified by South Korea and Singapore； and cooperative regulation， exemplified by the United Kingdom and Japan. This article analyzes these approaches， while proposing a number of recommendations， including accelerated legislation， coordinated governance， guiding industry self-discipline， and realizing the potential of schools and families.