This study aimed to assess the level of public trust in general practitioners (GPs) and its association with primary care contract services (PCCS) in China. Cross-sectional study. Between September and December 2021, 4158 residents across eastern, central, and western China completed a structured self-administered questionnaire. Trust was assessed using the Chinese version of Wake Forest Physician Trust Scale. Multivariable linear regression models were established to identify predictors of trust. The effect size of PCCS on trust was estimated by the average treatment effect for the treated (ATT) through propensity score matching. The study participants had a mean Wake Forest Physician Trust Scale score of 36.82 (standard deviation = 5.45). Enrollment with PCCS (β = 0.14, P < 0.01), Han ethnicity (β = 0.03, P < 0.05), lower educational attainment (β = −0.06, P < 0.01), higher individual monthly income (β = 0.03, P < 0.05), better self-rated health (β = 0.04, P < 0.05), chronic conditions (β = 0.07, P < 0.01), and higher familiarity with primary care services (β = 0.12, P < 0.01) and PCCS (β = 0.21, P < 0.01) were associated with higher trust in GPs. The ATT of PCCS exceeded 1 (P < 0.05). PCCS are associated with higher levels of trust in GPs. PCCS may become an effective tool to attract public trust in GPs, although the relationship between the two may be bi-directional.