Abstract: Influence of different concentration of NaCl and KNO3 treatment on 4 kinds of pepper seed germination and its isoenzyme activity was studied. The results showed that pepper of different kind made obvious distinction in germination percentage ,viability ,index and activity of POD,SOD, in which Tianying and reforming string-pepper 8819 were in higher level. Tianying showed contrary tendency of germination percentage when treating by NaCl and KNO3 .Chunyu got 71.4%, the biggest germination percentage by 0.3% KNO3 treatment, and distilled water could accelerate reforming string-pepper 8819 germination. Comparing to CK, POD isoenzyme bands of 4 kinds of pepper improved and dyed deeper ,and under NaCl treatment, SOD isoenzyme bands was brighter than by KNO3 ,which indicated that NaCl could enhance SOD isoenzyme activity remarkably.