先天愚型(Down综合征)是在人类被发现的(1959年)第一个染色体疾病。迄今,人类发现染色体疾病约300余种。而在染色体疾病中最常见的是先天愚型。其发生率动摇在1/600～700,如果我国儿童按3亿计算,那么全国就将有先天愚型500万左右。给家庭和社会造成了很大的负担。国外对此病报告较多,国内研究较少。关于先天愚型的核型分析,国内虽有报告(例数较少),但应用现代分带技术来分析其核型组成尚未见到。只有应用分带 Down’s syndrome is the first chromosomal disorder discovered in humans (1959). To date, humans have discovered about 300 chromosomal diseases. The most common chromosomal disease is Down’s syndrome. Its incidence fluctuated between 1/600 and 700. If the children in our country are calculated at 300 million, then the whole country will have about 5 million idols. To the family and society caused a great burden. Foreign reports of this disease more, less domestic research. On the Down’s syndrome type analysis, although the domestic report (fewer cases), but the use of modern zoning technology to analyze its karyotype composition has not been seen. Only application zoning