Contraindications for transferring frozen embryos mainly include severe genetic abnormalities of embryos, severe uterine abnormalities of the mother or severe autoimmune diseases, infectious diseases, etc. 1. Severe genetic abnormalities of embryos: embryos with genetic abnormalities may fail to implant, biochemical pregnancy, developmental malformations, or severe physiological dysfunction after birth and affect normal life after transfer. 2. Serious uterine abnormalities or autoimmune disease of the mother: serious uterine abnormalities of the mother, such as serious adhesions in the uterine cavity, serious malformations of the uterus or malignant tumors, etc., as well as serious autoimmune disease of the mother, such as systemic lupus erythematosus, etc., all of which will affect the embryo’s implantation and development. 3. One of the spouses has serious infectious diseases: if you are suffering from serious tuberculosis or hepatitis B and have not been cured, you should not undergo frozen embryo transfer, so as not to affect the embryo’s implantation and subsequent growth and development. It is recommended that couples with assisted reproduction needs should go to professional reproductive hospitals for consultation and exclude the contraindications to the transfer before undergoing frozen embryo transfer.