The causes of embryonic sterilizations are complex and varied, including maternal factors, embryonic factors, living habits, environmental factors, etc. Most of the causes can be identified through examination, but some cannot be detected. Maternal factors include genital lesions and malformations, infectious diseases, luteal insufficiency, etc.; embryonic factors are mainly chromosomal abnormalities; paternal factors include declining sperm quality, smoking and drinking, etc.; and environmental factors include indoor decoration pollution, atmospheric pollution and rays, etc. These may be detected through examination. These may be detected through examination. In addition to the above factors, there are many other causes that cannot be identified by adequate medical research, so some of the causes of embryonic sterilizations cannot be detected by examination, and it is recommended that the occurrence of embryonic sterilizations be prevented by actively doing preconception examinations and genetic counseling.