With the development of communication technology, chaotic communication technology has attracted the interest of many researchers for its resistance to multipath fading and strong confidentiality, among which Differential Chaos Shift Keying (DCSK) is the most widely studied non-coherent digital modulation scheme. Generalized Carrier Index Differential Chaos Shift Key‐ ing (GCI-DCSK) is the integration of the index modulation technique on the basis of DCSK, which further improves the system per‐ formance. In this paper, the GCI-DCSK modulation scheme is combined with the relay collaboration technique to extend the cover‐ age of the communication network and improve the communication quality.