To improve the non-biology-stability of pineapple vinegar,the clarification effects of 5 different quantities clarificants of glutin,agar,diatomite,chitosan and PVP on pineapple vinegar were compared.The result showed that the effect of each clarificant was different,agar was the best clarificant,followed by glutin and chitosan.When the quantity of agar adds to 0.20g/L,the transmittance of pineapple vinegar reached a maximum of 98.2%.