Objective To investigate the factors influencing the medication adherence among patients with diabetes signing family doctor service contract in Beijing urban areas, and provide the basis for improving the level of medication adherence. Methods A total of 320 patients with diabetes from four community health service centers in Beijing urban areas were selected to answer the questionnaires using convenient sampling from June to September 2015. Univariate analysis and binary logistic regression were used for the influencing factors analysis. Results A total of 320 questionnaires were distributed, and 317 valid questionnaires were recovered, in which the rate of high medication adherence was 54.6%. The results of logistic regression showed that the main impact factors on medication adherence were age [odds ratio (OR)=1.918, P=0.011)], degree of education (OR=2.462, P=0.008), knowledge related to diabetes (OR=1.773, P=0.027), adopting of family doctor service or not (OR=2.521, P=0.029) and social function status (P=0.003). Conclusions The family doctor service team should implement the practice of the family doctor service to ensure that the contracted residents can make full use of the family doctor services; and strengthen the follow-up and interventions for patients less aged or with low degree of education. For those with poor social function, more attention should be paid to their self-health management behavior to improve the level of patients’ compliance. As a result, the levels of blood glucose will be well controlled to reduce possibilities of complications and improve their health status and quality of life.