Aim To observe the effect of capsaicin on the experimental autoimmune neuritis( EAN) in rats and explore the mechanism. Methods To induce EAN,male Lewis rats were immunized with peripheralnerve myelin sheath antigen( P2_(57-81)) peptide and complete Freund's adjuvant( CFA) mixed liquor. Rapamycin( RAPA,2. 5 mg·kg~(-1)) was administered by intraperitoneal injection 0. 5 h after immunization and capsaicin( 1 mg · kg~(-1)·d~(-1)) was administered by intragastric administration 1. 0 h after immunization for15 d...