Family support system refers to the support that patients can get from family members, relatives and friends and the community in the process of rehabilitation nursing. Nursing diagnosis family support system is the evaluation and diagnosis of patients' family support system, aiming at understanding and evaluating family support resources and functions in order to provide appropriate nursing intervention and support. Family support system is very important for patients' rehabilitation and health. The patient's family environment and family relationship will affect the process and result of his rehabilitation. A good family support system can provide emotional support, daily life assistance, promote treatment compliance, help patients to actively cope with diseases, comply with treatment programs, and improve rehabilitation effects.