To investigate the effects of alternating application of graminaceous(Rye) and leguminous(Hairy vetch) green manures into a loam soil and crop rotation for organic red pepper(Capsicum annuum var.) cultivation, five treatments which was cultured during 4 years were compared at the out field: 1) a pepper single cropping + the mixed expeller cake, 2) a pepper culture + the winter cover crop(hairy vetch), 3) a pepper culture + hairy vetch / a soybean culture + rye, 4) a pepper culture + hairy vetch / a soybean culture + rye / a food corn + a young radish, 5) a conventional pepper culture. Here, hairy vetch and rye were cultivated as winter cover crops from late September to middle May. Nitrogen amount fixed by hairy vetch was about 120 kg ha-1 per a cropping season, corresponding to 60% N level needed for red pepper production, and was about 69 kg ha-1 as rye green manure. In these results, the changes of physico-chemical properties in soil cultured by green manures and rotation crops for 4 years, pH of all treatments was more decreased about 5.5 to 6.0 than before test cultural soil at pH 6.9. However, EC levels were gradually increased at all of the treatment. Organic matter(O.M) and available phosphate(P2O5) contents in No. 2, 3 and 4 soils which was farmed as the organic farming cultivation were improved by 25~30 g/kg and 350~400 mg kg-1, respectively. The aspect of soil physical parameter, bulk density(BD) of organic fields was more declined as 1.25~1.30 Mg m3 -1 than BD 1.38 Mg m3 -1 of the conventional field. At the yields of organic and conventional culture, the amount of organic red pepper was reduced about 5~13% range compared with the conventional yield as 279 kg 10a-1 average during 4 years, but the plant growth was not significantly different among 5 plots. Consequently, these results are demonstrated that application of green manure and rotation cropping system for organic pepper cultivation is used to improve soil fertility and rhizosphere environment conditions at the out field.