Objectives: To evaluate the psychometric properties of the C‐CaSPUN in Chinese family caregivers (FCs) of cancer survivors (CaS) and to compare the unmet needs of CaS‐FC dyads. Methods: A questionnaire survey, consisting of five Chinese version measurement scales, was used to collect data from CaS‐FC dyads. Statistical methods used included exploratory factor analysis (EFA), confirmatory factor analysis (CFA), Cronbach's α, intraclass correlation coefficient (ICC) and Pearson's correlation. Results: Participants consisted of 610 survivor–caregiver dyads. EFA and CFA established the four‐factor construct C‐CaSPUN, comprising relationship impact and life perspective, information and health care, quality of life (QoL) and survivorship care. All of the C‐CaSPUN scales had good internal reliability (Cronbach's α ≥ 0.752). The ICC for test–retest ranged from 0.645 to 0.782 at the scale level, with an average ICC value of 0.653. The concurrent validity was evidenced by C‐CaSPUN being negatively associated with SF‐12 MCS and positively related to anxiety and/or depression. In addition, the correlation coefficient scores between C‐CaSPUN factors and the C‐CaSUN total scale ranged from moderate to good (r = 0.505–0.671). Conclusions: Study findings may support the reliability and validity of the C‐CaSPUN in measuring the unmet needs of FCs of Chinese CaS.