Introduction: DRC is one of Sub-Saharan Africa country with high infant and maternal mortality. The major problem is the underuse of health services because of inaccessibility on all fronts and also the population under-information to the health and development problems. Community participation is one of the basic requirements and basic principles of the Primary Health Care to solve this problem. That is why we choose Mosango RHZ to assess the improvement of demand for health services with the involvement of community health workers. Methods: We conduct a cross-sectional study carried out in Mosango RHZ in 2019. The study combined a mixed method (quantitative and qualitative) based on the realist evaluation approach which takes into account the Context-Mechanisms-Effects explained in the conceptual framework model. Results: Four predictive factors determine the improvement of health indicators with the involvement of CHWS in activities of the Mosango RHZ: Having attended school (p = 0.000; OR = 0.150); Having sufficient theoretical knowledge on malaria, diarrhoea, pneumonia, malnutrition, availability of inputs to treat these diseases (p = 0.004; OR = 0.192); Having taken the training as CHWS and Having undergone more than one training as CHW (p = 0.013; OR = 0.074). This result corroborated with other studies carried in low-and middle-income countries like DRC. Conclusion: