A major challenge for policymakers is how to design and implement payment systems for healthcare providers. Due to their direct effect on healthcare providers’ behavior, payment systems are essential knops to healthcare system reforms.Among all healthcare providers, physician’s roles are of significant importance. Despite the fact that physician direct costs make one fifth of the total healthcare costs, Due to the asymmetric information between physicians and patients and the agent role that physicians play in how patients make decisions in respect to the healthcare market, physicians’ decisions indirectly have effects on different healthcare costs items like medicine expenses and use of hospital services. The way that a physician gets paid causes different motivations for them to make decisions. Often economical models evaluate the effects of a payment method on a physician’s behavior in such perspective: services they supply, demands that they induce and the number of the patients they admit. The role of a family physician as the gatekeeper gives them more significance in comparison with other physicians. However, they are accounted patients’ managers in healthcare systems. Thus double importance is ascribed to designing and implementing a family doctor’s payment system, which will have direct and indirect effects on healthcare system functions.