Internet　addiction　among　college　students　has　become　a　serious　problem　in　China.　This　pilot　study　involved　the　development　of　an　online　expert　system　named　Healthy　Online　Self-helping　Center　(HOSC)　as　an　intervention　tool　to　help　those　who　wish　to　reduce　online　usage.　The　study　also　explored　the　effectiveness　of　HOSC　for　college　students＇　Internet　addiction　behavior.　Participants　(N=65)　were　recruited　from　a　university　in　Beijing,　and　were　randomly　assigned　to　one　of　four　conditions:　using　HOSC　within　a　laboratory　environment,　using　HOSC　within　a　natural　environment,　using　a　noninteractive　program,　and　a　control　group.　All　the　participants　were　asked　to　answer　questionnaires　at　the　baseline　and　at　the　1-month　follow-up.　The　questionnaires　included　the　participants＇　online　hours　per　week,　the　legitimate　ratio　of　Internet　usage,　online　satisfaction,　and　the　Young＇s　Diagnostic　Questionnaire.　The　results　revealed　that　HOSC　under　both　natural　and　laboratory　environments　could　effectively　reduce　the　participants＇　online　hours　per　week　as　well　as　their　Young＇s　Diagnostic　Questionnaire　score,　and　improve　online　satisfaction　at　a　1-month　follow-up.　Participants　using　a　noninteractive　program　also　had　similar　results.　The　article　concludes　with　a　discussion　of　the　limitations　of　the　study,　as　well　as　the　implications　of　the　findings　and　future　research　directions.　©　Copyright　2011,　Mary　Ann　Liebert,　Inc.