摘要:AbstractIntroduction;Improving the individuals’ health is one of the most important factors in communities. Nowadays, the health is considered as a complete physical and mental welfare. Not just the absence of disease or disability, the concepts such as self-satisfaction,life expectancy and social welfare in mental health description are the factors considered by World Health Organization,which are along with positive emotions like joy, peace, and happiness.Happiness, in thefield of psychology, is a positive emotion and deeper than a temporary good condition.Happiness is a stable feeling in positive emotions,understanding the reality of life and is meaningful.Happiness and mental health include positive emotions such as joy, peace, the sense of flowing and the fascination in life. General satisfaction, in various aspects of life, is called happiness.Purpose:To create happiness in people, motivational and cognitive processes can be taught to people that cause or increase the happiness. The aim of this study is to determine the effectiveness of social skills training on students’ levels of happiness.Materials and methods:This study is experimentally conducted by pre-test, post- test and proceeding in control group. The subjects of the study are selected from four groups of male and female students, two experimental groups and two control groups. The method of social skills training was as an independent variable and the level of happiness was as a dependent variable. They conducted the pre-test before training and post-test after four weeks of training, and proceeding six weeks after training. The statistical universe of this study includes all third year students in Babol University of Medical Sciences in academic year of 88. The sample group consisted of 100 students (males/females) who were selected by multistage random cluster sampling To measure the levels of students’ happiness, the Oxford Happiness Questionnaire was used which has 29 questions withfour options. The intervention method- Levinson and Goth Lyb's‘social skills training program: the social skills training program is a great series of cognitive and behavioral techniques to increase the individuals’ happiness developed by Levinson and Goth Lyb (1995).To data analysis, the method of descriptive and inferential statistics indexes and SPSS software were used.Results:The statistical analysis indicated a significant difference between pre-test and post-test scores of students’ levels of happiness. So, it can be said that the social skills training programs lead to increase the levels of happiness. According to the results, there is no significant difference between male and female students’ levels of happiness. And also, regarding to the effectiveness of social skills training program, there is no significant difference between males and females.Conclusion:The findings indicated that Levinson and Goth Lyb's social skills training method is effective to increase the students’ levels of happiness. Regarding the continuation of happiness during the time, the studies indicated that the subjects even at the time of proceeding and after a long time were happy. In general, the researches indicated that happy and unhappy people are different in terms of intellectual structure, judgments and motivation. Happy people have more individual, familial, job, educational and social efficiency. Because the feeling of welfare and happiness has a significant role in students’ mental health, and all people aware of its positive effects on personal, familial, social, educational and job aspects, it is recommended that special attention should be paid to mental health. These findings indicate the importance of social skills training workshops in the first year of university. Due to its cost-effectiveness, in terms of both space and time, this program can be used well in university.