Purpose: The purpose of this study was to predict marital instability based on emotional maturity and parental bonding of couples in Shiraz. Method: The current research is a correlational project. The statistical population of the study consisted of all couples living in Shiraz who lived in this city in 2017, and the sample size was 200 couples from the city of Shiraz; available sampling method was used to sample these couples. The research instruments consisted of Emotional Maturity Scale (EMS), Parental Bonding Instrument (PBI), and Marital Instability Index (MII). Results: For data analysis, SPSS software had been used. Pearson correlation coefficient and multiple regression analysis showed that care dimension could negatively and significantly predict marital instability, and overprotection dimension could positively and significantly predict marital instability. Based on other results, dimensions such as lack of Emotional stability and social maladjustment as well as lack of independence are able to predict marital instability positively and significantly.
