Introduction: A life-threatening illness can cause the involvement of family members and the imposition of psychological and physical stress on them. Certainly, the family is a very valuable resource in patient care and plays an important role in maintaining the emotional support and patient’ s recovery. The aim of this study was to explain the family members’ supporting behaviors of the patient admitted to the cardiac special units. Methods: This qualitative study was performed in the cardiac special units in Isfahan. The number of participants was 20, including 5 nurses, 8 family members, and 7 patients. The data were collected through interview and observation by purposive sampling. Then, the data were analyzed by Graneheim and Lundman’ s qualitative content analysis method. The study lasted 12 months. Results: Data analysis showed that family’ s support can be classified into three levels, including support by the therapeutic alliance (attempts to console and reassure, restoration of selfesteem, diminishing patient’ s insensitivity, commitment to the patient, and visiting the patient ), participatory information (obtaining reliable information from the nurse, active role in providing meaningful information about the patient’ s prognosis), practical and instrumental support (searching for economic support resources, providing the patient with the necessary equipment, trying to do the right care taking into account the family culture). Conclusion: Understanding family’ s supportive behaviors can help improve counseling and planning for quality care of patients admitted to the cardiac care units (CCUs).