Abstract This paper focuses on the abnormal return of FHC`s self-risk before and after it was set up, in order to judge if its performance was changed or not. And to discuss if investors change their opinion of FHC`s run-efficiency. This study draws on the method of event study and aims on the declare day and set-up day. We use the multiple-index model to find the FHC`s self-risk from the total risk and check the abnormal return. The research finds that the abnormal return was exist and investors prefer the private BHC.