The consumption of soybean as food by human has a thousands-of -year history .soybean isoflavone is the essence of soybean obtained with modern technology,and is veryfied by FDA in October 1999 and adverse effect of synthetic hormones .it may regulate bidirectionally the level of estrogen .balance the distributing off estrogen,alleviate the bad symptom caused by climacteric or premature senility of ovary for women ,and improve the quality of sex life .