Abstract: Peer support refers to the people with similar stress or health problems get gathered and obtain information and emotional support from each other. This article summarizes the implementation mode，intervention effects，mechanism and challenges of peer support in the rehabilitation process of ICU patients，and puts forward suggestions for further intervention and research in the future. Peer support can provide necessary support and help for severe patients，but the implementation mode and evaluation method need to be further optimized and improved.

Key words: Peer Influence, Critical Illness, Post Intensive Care Syndrome, Rehabilitation, Review Literature as Topic