The causes of embryonic arrest at 10 weeks of pregnancy may be fetal, maternal and environmental. 1. Fetal causes: the most common is fetal chromosomal abnormality, such as trisomy 13, trisomy 18 and trisomy 21 and other chromosomal abnormalities. 2. Maternal causes: the mother suffers from systemic diseases such as severe infections, high fever, severe anemia, etc., or endocrine abnormalities, such as hypothyroidism, diabetes mellitus, poor glycemic control and so on. Or abnormal immune function: such as the combination of antiphospholipid antibodies, lupus anticoagulant factor positive. All of them are possible factors of embryonic sterilizations 3. Environmental reasons: exposure to excessive radiation, formaldehyde, benzene and ethylene oxide and other chemical substances are also prone to cause fetal arrest. When the 10 weeks of pregnancy in the fetal arrest should be under the guidance of the doctor to actively find the cause, and give appropriate treatment.