The purpose of this study is to investigate the factors that have an impact on the happiness level. For this reason, 453 individual (191 males and 262 females) were selected randomly in Yazd and they were given the Oxford happiness questionnaire and demographic questionnaires (including some criteria such as: age, sex, education, Job, marital status, religious and athletic and artistic activities). The findings of the study indicate that there is a positive connection between age, sex, education, athletic and religious and artistic activities and the happiness level. Also there is a negative relationship between physical. And psychological health, social- family relations, optimism, view of happiness and happiness scores in the study.