Under context of aging population and chronic disease with high occurrence as well as difficulty and expensive costs in medical treatment, the establishment about system of family doctors has been brought about in China, but there lacks domestic research for process of policy evolution endowed with such significance. This paper tries to analyze process of institutional establishment of family doctors in view of multiple-streams theory; the evolution process about institutional construction of family doctors should have systematic classification with analysis of problem stream, policy stream and political stream respectively as well as facts based on fundamental challenges of grassroots public health; explanation should be made for features and inspiration about institutional construction of family doctors to further verify feasibility of multiple streams theory in China. The fact has found that social background and actor will influence agenda about institutional construction of family doctors, some agenda of basic public health service policy will not be promoted by accidental focus events; active public participation and attention will exert influence for formation of political stream. Keywords: family doctor, multiple-streams theory, policy process, agenda setting.