Using　the　CAD-40　polymeric　adsorbent　to　adsorb　the　pepsin　inhibitor　from　the　culture　filtrate　is　better　than　the　solvent　extraction.　The　result　of　this　investigation　shows　that　the　sorption　efficiency　is　best　at　pH　=　6.　The　adsorbent　after　washed　with　distilled　water　or　with　0.05　mol/L　ammonia　spirit,　and　then　eluted　with　95%　ethanol　aqueous　solution.　The　inhibitor　extraction　efficiency　with　this　method　increases　by　15%　in　comparing　with　the　solvent　extraction.