The present invention relates to an effective component which can improve or prevent the hemorheological abnormalities. Said effective component mainly comprises more than milligtam Epigallocatechin-3-gallate (EGCG) to improve or Prevent the hemorheological abnormalities from aging, to decrease the probability of disease arose from the hemorheological abnormalities.本發明係關於改善或預防血液流變異常之有效性成分,其主要包含毫克以上之表沒食子兒茶素沒食子酸,可改善或預防老化所引起之血液流變異常(高血液黏度、高血液黏彈性、高血液聚集性、低紅血球變形能力...等等),進一步降低或預防因血液流變異常所引起的疾病(例如:高血壓、心血管疾病、中風等)。