Objective:To explore the relationship among the cancer-related fatigue,coping styles and quality of life in breast cancer patients with chemotherapy.Methods:A total 120 female breast cancer patients were selected as the subjects.The instrument used for data collection was a questionnaire that was composed of four parts:the demographic data form,the Revised Piper Fatigue Scale (PFS),Jalowiec Coping Scale (JCS),Quality of Life Questionnaire-Core 30 (QLQ-C30),and Quality of Life Questionnaire-Breast 23 (QLQ-BR23).The statistical software SPSS was used for data analysis.Cancer-related fatigue,coping styles,quality of life and their related factors were determined by nonparametric tests.Spearman correlation coefficient was used to investigate the relationship among cancer-related fatigue,coping styles and quality of life in breast cancer patients with chemotherapy.Results:There was a significant negative moderate correlation between cancer-related fatigue and the quality of life (r＝-0.24,P<0.01),and negative correlation between cancer-related fatigue and the total health status (r＝-0.39,P<0.01).The positive coping styles including optimistic and confronting were negatively correlated with cancer-related fatigue (r＝-0.25,-0.18，Ps<0.05),and were positively related to the functional domain of quality of life(r＝0.35，0.21， Ps<0.05).The positive coping styles including emotive,fatalistic,and palliative were positively correlated with cancer-related fatigue (r＝0.25,0.18,and 0.28， Ps<0.05),and were negatively correlated with the functional domain of quality of life (r＝-0.40,-0.32，Ps<0.05),and emotive and fatalistic were positively related to the symptomatic domain of quality of life(r＝0.40,0.28,Ps<0.05).Conclusion:There exists a certain degree of correlation among cancer-related fatigue,coping styles and quality of life in breast cancer patients with chemotherapy,which may guide the clinical care.