Abstract: Soybean isoflavones have important biological activities. Soybean and production of soybean have a lot of isoflavones.The research was mainly engaged in the constitution and structure of soybean isflavones, biological function and methodology ofabstraction, some kinds of factors affect amount of soybean isflavones: varieties, conditions of planting, conditions of preservationministries of seed, methodology of processing, soybean isflavones application in healthy foods. The condition of marketplace and itsprospective development were also discussed.

Key words: soy, soybean isflavones, chemical structure, biological function, methodology of abstraction