自然流产大致分胎儿和母体两方面的原因。胎儿方面,特别是受精卵的染色体异常是最主要的原因之一,约50％的自然流产由染色体异常引起。而流产儿中所见的染色体异常,多为数目上的。染色体结构异常的病例虽是少数,但也有发现。结构异常是在配子形成时发生的,当双亲的任何一方为染色体易位的携带者时,该易位可传给子女,致使反复流早死产。本文报告了习惯性流早死产患者423例中的6例具染色体结构异常病例的染色体分 Spontaneous abortion roughly divided into fetal and maternal two reasons. Fetal aspects, especially the fertilized egg chromosomal abnormalities is one of the most important reasons, about 50% of spontaneous abortion caused by chromosomal abnormalities. Chromosome abnormalities seen in abortion children, mostly on the number. Chromosome structural abnormalities, although a small number of cases, but also found. Structural abnormalities occur during gamete formation, and when either parent is a carrier of a chromosomal translocation, the translocation can be passed on to the child, resulting in repeated premature rupture of the flow. This paper reports the chromosomal distribution of 6 cases of chromosomal abnormalities in 423 cases of habitual early preterm birth