RESUMEN
The most important reason in couples' marital conflict is their expectancy of their roles in the family. The couples get married by presumptions and different prejudices about emotional subjects and life activities which are the mental well-being. The purpose of this research is the study of mental well-being and marital life quality of couples. The method is cluster sampling in which 50 couples are selected from clinical and health centers of Sirjan. The research method is descriptive- correlation and all data were gathered by Golombok-Rust' marital quality, PANAS scale for positive and negative affect and Debz's life satisfaction questionnaire. All data were analyzed by correlation, regression and variance in SPSS. The results show that there is a positive relationship between marital quality and life satisfaction as a rate of 0.435 [p>0.001], marital quality and positive affect as a rate of 0.322 [p>0.05], life satisfaction and positive affect as a rate of 0.754 [p>0.001]. However, there is a negative relationship between positive effect and negative effect as a rate of 0.205 [p>0.05], and marital quality and negative affect 0.036 [p>0.05]. Since mental well-being increase can anticipate marital life quality; couples' mental well-being strength is a suitable method for marital satisfaction improvement and marital quality which should be studied