PURPOSE: A Rhynchosia Nulubilis cheonggukjang(fermented soybean paste) extract and a composition containing the same are provided to suppress pathogenic bacteria breeding, to ensure antibacterial effect against pathogenic bacteria especially uro-virulent bacteria, and to replace existing antibiotics.CONSTITUTION: A composition for suppressing pathogenic bacteria breeding contains a Rhynchosia Nulubilis cheonggukjang extract as an active ingredient. The extract contains delphinidine and a peptide containing 6 amino acids. The Rhynchosia Nulubilis cheonggukjang extract is prepared by preparing cheonggukjang by fermenting Rhynchosia Nulubilis with Bacillus sp. and extracting cheonggukjang with hot water. The pathogenic bacteria are Staphylococcus aureus and Psudomonas aeruginosa.COPYRIGHT KIPO 2013[Reference numerals] (AA) Delphinidine at 7 minute본 발명은 병원성 세균의 증식을 억제하는 조성물에 대한 것으로, 특히 서리태 청국장 추출물을 유효성분으로 포함하여, 스타필로코커스 아우레우스(Staphylococcus aureus)와 수도모나스 에루기노사(Psudomonas aeruginosa)와 같은 병원성 세균의 증식을 효과적으로 억제할 수 있는 조성물에 대한 것이다.