The present study was conducted with the aim of investigating the structural relationships of psychological capital and the ability to forgive on family strength through the mediation of the meaning of life. This is a descriptive and correlational research that was done in the form of structural equation modeling. The statistical population was all the married employees with children in the executive bodies of Rasht, 400 people (200 men and 200 women) were randomly selected. To collect data, the psychological capital questionnaires of Luthans, Forgiveness Ray et al., family strength of Sham et al., and the meaning of life questionnaire of Steger et al. were used. SPSS26 and AMOS24 software were used for data analysis and model fitting, and bootstrap method was used in MACRO Preacher and Hayes program to investigate the role of mediating variables. The results showed that the proposed model has a good fit, psychological capital and the ability to forgive have a direct effect on family strength, Psychological capital has an indirect and significant effect on family strength through the meaning of life, and the ability to forgive has an indirect and significant effect on family strength through the meaning of life. Therefore, this conceptual model can be used in the process of family counseling interventions and couple therapy to improve the quality of life as well as the strength of the family.