Abstract Background & Objectives: The most important asset of organizations and the main factor in achieving the goals and plans of any organization are the employees who work in it. Experts believe that without skilled, capable, committed, and satisfied human resources, it is impossible to achieve organizational goals. In recent years, improving job performance and empowering employees as a human resource strategy has been used to create greater efficiency, productivity and satisfaction of employees in the workplace. It seems necessary to study the factors that affect the improvement of job performance of employees in organizations. Among the various professions, the firefighter profession is one of the most sensitive and vital, because it deals with people's lives and property. Accordingly, the performance of firefighters as providers of people's lives and property requires capabilities and skills that they must possess and be able to provide maximum services in the shortest possible time. They must also be trained in how to make decisions correctly and quickly in emergency rescue and relief operations, and to anticipate and prevent mistakes that may occur during decision-making. Therefore, the current research was conducted to predict Job Performance of fire department employees Based on emotional intelligence with the mediation role of communication skills. Methods:The present study was correlational and used structural equation modeling. The statistical population of this study consisted of all employees of the Fire Department of Sari City in 2024, totaling 1,000 individuals, from whom 260 participants were selected through a multi–stage cluster sampling method. Specifically, all employees were first classified according to different districts of Sari City (two districts), with each district comprising four fire stations. Within each station, personnel were further categorized based on their respective operational units. Subsequently, proportional sampling was conducted according to the ratio of employees in each unit to the total number of employees in the fire stations under study. The research tools were the Job Performance Inventory Questionnaire (Putterson, 1992), the Emotional Intelligence Scale (Bar_on, 1980), and the Communication Skills Scale (Queendom, 2004).Data were analyzed using SPSS version 26 and structural equation modeling (SEM) at a significance level of 0.05. Results: The findings indicated that, based on the obtained goodness-of-fit indices, the data were well-fitted to the proposed research model (χ2=78/445, df=63, P= 0/078, χ2/df=1/265, GFI= 0/957, AGFI= 0/938, CFI= 0/995, RMSEA= 0/031, PCLOSE= 0/948). According to the results, emotional intelligence positively predicted the variables of communication skills (Γ = 0.495, p < 0.001) and job performance (Γ = 0.403, p < 0.001). Moreover, communication skills positively and significantly predicted job performance (β = 0.549, p < 0.001). In addition, emotional intelligence also predicted job performance indirectly through communication skills (β = 0.271, p < 0.001). Conclusion: Based on the results of the study, emotional intelligence and communication skills have a significant relationship with job performance. Therefore, as the emotional intelligence and communication skills, the level of job performance in the person increase. Considering that, the variables of emotional intelligence and communication skills had the power of predictor of Job performance, it is suggested that organizational managers, psychologist and counselors pay more attention to these factors to provide solutions to promote Job performance working firefighters Staff.