Who is willing to participate in and provide Family Doctor Contract Service?: A cross-sectional study based on the medical staff's perspective in China

China encourages medical staff from non-primary hospitals (higher-level hospitals) to participate in and provide Family Doctor Contract Service (FDCS) due to a lack of primary medical resources in community health service centers. This study aims to explore the factors affecting the willingness of family doctor contracting from the tertiary hospital medical staff's perspective. An anonymous self-administered survey was conducted among the medical staff from tertiary hospitals in Hangzhou, Zhejiang Province. Information of the socio-demographic characteristics, the willingness of participating in FDCS and its related reasons, and factors that might affect willingness were investigated. A multivariate logistic regression was used to identify the statistically significant variables associated with willingness. (1).. with higher education level; (2).. having better knowledge with family doctor; (3).. being more attracted by the national policy of FDCS; (4).. thinking it help for income increase. The majority of willing doctors (25.95%) believed that participating in FDCS could help them achieve their personal value, and the reason chosen most for unwilling reason was “low income and unrealized personal value (32.21%).” It is necessary for the government to establish the essential matching mechanisms to guarantee the development of the family doctor, including increasing the final financial support for primary health facilities, and developing the national incentive mechanism for family doctors.