Treatment method for excitatory neurotoxicity-related injury

Provided in the present application is a peptide containing the amino acid sequence YEKLTTLDTGGV (SEQ ID NO:1) or a functional variant thereof, the peptide being an active peptide for treating central nervous system injury. Also provided in the present application is a chimeric peptide comprising the active peptide and an internalisation peptide. Also provided in the present application is a pharmaceutical composition comprising the active peptide or the chimeric peptide, and a medical application for the active peptide or the chimeric peptide.