Transferring two embryos without implantation may be due to poor embryo development, uneven or too thin endometrium of the woman’s uterus, low progesterone and so on. 1. Poor embryo development: Embryo quality is an important factor in determining the successful implantation and development of embryos after transfer. If the embryo has chromosomal abnormality, etc., then the embryo will not be easy to implant. 2. Uneven or too thin uterine lining: The internal environment of the uterus is also an important reason that affects embryo implantation. When two embryos are transferred and don’t implant, you need to check whether the endometrium of the woman is uneven or too thin. If the lining of the uterus is thick enough, above 8mm, and the blood flow is good, then the embryo is more likely to be able to settle. 3. Low progesterone: a good endocrine environment is also very important for the implantation of embryos, such as low progesterone may affect the successful implantation of embryos. 4. Other: the quality of semen can also affect the quality of embryos, which requires the man to have a regular work and rest schedule, avoid eating and drinking alcohol, and reduce the number of late nights. The transfer of two embryos do not implantation is recommended to consult a doctor for examination, to clarify the cause of the treatment and conditioning, in order to ensure the successful implantation of embryos.