This study aimed to investigate the reasons that players play the online game of Happy Farm(HF) on facebook, and to investigate the relationship among disinhibition, conformity and Internet addiction of HF¡¦s players. Data was collected from a sample of 298 players who played on HF. Instruments include three types of measures, HF Disinhibition Scale, HF Conformity Scale and HF Internet Addiction Scale. Data analysis methods included Descriptive statistics, Independent-Samples T Test, One-way ANOVA, MANOVA, Pearson correlation, and Multiple Regression Analysis. The findings from the study were summarized as follows: (a)There were more female players are more than male players on HF. (b)The main reason for the players to play HF is to kill time. (c) Players of HF did not show a tendency of disinhibition, conformity and Internet addiction .(d)There was a significantly positive correlation between disinhibition and Internet addiction on HF. (e) There was a significantly positive correlation between conformity and Internet addiction on HF. (f) Self-disclosure and compliance were the most significant predictor to predict Internet addiction on HF.