Abstract We use the stellar evolution code MESA to study negative jet feedback mechanism in common envelope supernovae (CEJSNe), which a neutron star (NS) launches jets of red supergiant (RSG). find that reduces mass accretion rate be χ j ≃ 0.04–0.3 times without operation jets. mimic effect on RSG by depositing energy carry into zones outside NS orbit. The deposition inflates envelope, therefo...