Abstract: Objective To investigate the influence of mutual support intervention on the level of family care and social support in patients with prosthesis reconstruction after modified radical breast surgery. Methods From January 2021 to June 2022， 160 patients with prosthesis reconstruction after modified radical breast surgery were prospectively selected. Patients were divided into control group （80 cases） and study group （80 cases） by random number table method， and were given routine health education intervention and mutual support intervention respectively. The scores of quality of life measurement scale， family caring index questionnaire and perceptive social support scale were compared between the two groups. Results  Symptom dimension scores of the study group at 1 month， 3 months and 6 months after surgery were significantly lower than those of the control group（ P<0.05）. The functional scores of the study group at 1 month， 3 months and 6 months after surgery were significantly higher than those of the control group（ P<0.05）. At the same time， the scores of the study group at 3 and 6 months after surgery were significantly better than those at 1 month after surgery （P<0.05）. The family care index questionnaire score and perceptive social support scale score of the study group at 1 month， 3 months and 6 months after surgery were significantly higher than those of the control group（ P<0.05）. At the same time， the scores of the study group at 3 and 6 months after surgery were significantly higher than those at 1 month after surgery （P<0.05）. Conclusion Mutual support intervention can effectively improve the quality of life， improve the state of family care and enhance the level of social support for patients with prosthesis reconstruction after modified radical breast surgery. 

Key words: Mutual support intervention, &emsp, Breast cancer, &emsp, Surgery, &emsp, Prosthesis reconstruction, &emsp, Family care, &emsp, Social support