Objective: To study the effect of community methadone maintenance treatment among patients who had addicted to heroin in Lianyungang City. Methods: 480 patients who had entered the treatment center by the end of December 31,2009 were followed up for 1 year. Face-to-face investigation was conducted among 207 patients for baseline,6-month and 1-year evaluation with questionnaire by the doctor. The content is concerned to heroin abuse,present job status and social function. Results: The retention rate was 48.96% in this study. Along with the length of treatment,the proportion of both having a job and living with relatives increased in the two evaluation groups(P < 0.05). Social function and family function were recovered gradually. Heroin abuse behavior,injection and syringe-sharing behavior were statistically difference among the three groups(P < 0.05). With the exception of 2 HIV positive cases that had been infected before the program was initiated,none of the HIV negative patient had seroconverted to the HIV positive status. Conclusion: Services provided by Community-based methadone maintenance treatment was thought to reduce drug-use and HIV related high risk behaviors such as sharing syringes. Family function and social function were improved after treatment. In-depth counseling and support from the society were urgently required aimed at the individual cases.