After the Menyuan M_S 6.9 earthquake occurred on January 8, 2022, the aftershock catalogue contains a large number of single-station events. To solve the inaccuracy of single-station event location, this paper used the source location method of coda wave interference (CWI) to relocate 101 single-station events recorded by Menyuan station within 8 hours after the mainshock. First, we calculated the interval uncertainty matrix of the coda wave part of the event pair, so as to estimate the interval between the seismic event pairs with similar focal mechanism in the cluster. Then, we solved the relative position of a group of events in the cluster by optimizing the interval. Finally, the relocation results were evaluated and found to be relatively reliable.