Positive psychology is the scientific study of positive experiences, positive individual traits and positive institutions that facilitate their development. Psychological intervention is applied in the health of the drug abstainers in recent days to help them quit drugs. This study focused on the positive strength of the drug abstainers. We tried applying positive psychology to the intervention of the abstainers. We designed a series of courses and activities for them. A sample of 28 subjects(2 of them quitted because of their sickness during the study) from the drug rehabilitation center was selected to participate in the study. 13 of them were in the experimental group and 13 in the control group. They completed the Affect Scale and the Life Orientation Test(LOT). The experimental group took part in the Group counseling for 4 months, 4 courses per month. The 16 courses included the topic of family love, thanksgiving, positive communication, optimism, confidence and hope etc. The control group did not have any course. Before the intervention, there was no significant difference between the two groups. The results showed that the score of the Affect Scale and the LOT of the experimental group were both significantly higher after the group counseling. In the interview, the subjects of the experimental group agreed that they benefited from the group activities. For example, one participant began to write to his son after our group activities and even sent a birthday card to the son. Another participant who used to reject his mother agreed to meet her and they had a warm talk. He began to understand and accept his mother. The subjects also felt comfortable and safe during the activities. In conclusion, group counseling based on the positive psychology can help to raise the positive strength such as positive affect and optimism of the drug abstainers. Group counseling is an effective way in the psychological intervention of the drug abstainers.