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To describe illness perceptions of breast cancer-related lymphedema (BCRL) and adherence to BCRL risk management behaviours and analyse the relationship between these factors in postoperative breast cancer survivors in China.A cross-sectional study was conducted in the first half of 2019 using 281 breast cancer survivors. Participants' illness perceptions and adherence to BCRL risk management behaviours at the 3rd month after surgery were investigated using the Revised Illness Perception Questionnaire for BCRL (IPQ-R [BCRL]), Lymphedema Risk Management Behaviour Questionnaire (LRMBQ), and Functional Exercise Adherence Scale (FEAS). The relationship between these variables was studied using correlation analysis and multiple linear regression analysis.Among the four dimensions of the LRMBQ, the mean score of our respondents received in "skin care" was 3.63 (S.D. 0.67), which was the lowest on the dimension, demonstrating the worst performance in this aspect. Regarding the FEAS results, better functional exercise adherence was observed in our sample compared to previous Chinese research. The results also showed that adherence to BCRL risk management behaviours was related to patient age and degree of education. Furthermore, other dimensions of illness perceptions, such as consequence, timeline acute/chronic, illness coherence and identity, follow their multiple linear regression equations with their corresponding BCRL risk management behaviour adherence.Our findings confirmed the importance of illness perceptions for adherence to BCRL risk management behaviours, suggesting that we need to pay attention to patients' cognition in this respect and supply necessary interventions.