Human resources are the most valuable capital of an organization, and managers are trying to provide motivation and productivity along with preserving the workforce. One way to motivate and increase productivity is to provide welfare services to employees. Using Adams' theory of equality, the current research attempts to design a desirable model for providing welfare services in the organization. It is an applied, descriptive and survey type research. The statistical population includes the staff of District 22 of Municipality of Tehran. Using the principles of sampling size in multivariate regression analysis, 357 questionnaires were completed by cluster sampling method. The process of data analysis was carried out in two stages: determining the relationships between variables and the dynamics of the systems. The results showed that the improvement of financial services was recognized as an attractive scenario of this research because of a 30% increase in productivity. Meanwhile, 38% increase motivation and 27% reduce dissatisfaction. Improvement in entertainment services has been identified as a desirable research scenario due to the optimal and simultaneous increase in motivation and quality of work life. Improving health services has been identified as a weak scenario for not having a significant impact on state variables due to the lack of influence on state variables.