The conditions for transferring fresh embryos after egg retrieval include normal ovarian function, suitable thickness of the lining, and sufficient hormone levels. 1. Normal ovarian function: Since drugs need to be given to promote follicular development and maturation before egg retrieval to obtain high-quality eggs, it is also necessary to ensure that ovarian function is normal before transferring after egg retrieval. 2. Appropriate endometrial thickness: ultrasonography is needed to know the thickness of the endometrium, only when the thickness of the endometrium is around 0.8mm, it is more suitable for implantation, when the endometrium is thin, it is not suitable for embryo implantation. 3. Sufficient hormone level: it is necessary to check the level of estrogen and progesterone in the body to understand the technical level, if the value of progesterone is on the low side, it is easy to lead to the failure of transferring fresh embryo after transferring. Whether to transfer fresh embryos after egg collection should strictly follow the doctor’s advice, and cannot decide by oneself arbitrarily.