Xiao Zhang is a 33-year-old woman, outstanding work performance, stable income, family relations, the envy of many people, however, she has more than 30 years old, but she has untold pain, 3 years of the couple carefully, carefully arranged their lives, but she is pregnant to more than 60 days embryo no fetal heart, that is, the embryo stopped developing, more let them sad is already four times in a row. Like Xiao Zhang this situation is clinically known as recurrent miscarriage, what used to be called habitual miscarriage, the main reasons for the occurrence of the following aspects: 1, chromosomal abnormalities: one or both men and women chromosomal structure, number of abnormalities, resulting in early embryonic miscarriage is the most common factor. 2, endocrine imbalance: such as menstrual flow, irregular cycle before and after, premenstrual breast pain, lactation, menstrual thinning, obesity, thick hair, etc. 3, Infection factors: Toxoplasma gondii, giant cell, herpes simplex, mycoplasma, chlamydia and other infections are another cause of embryonic arrest. 4, immunological factors: for the female, the fertilized egg is a foreign body and collectively will produce an immune rejection reaction, but why only some women miscarry because of this is because the organism has a protective mechanism. 5, other: such as anatomical factors, external factors, etc.