The key factor that determines the success of IVF is the embryo and the uterine environment, just like the relationship between the “seed” and the “soil” when planting. A good embryo is like a good seed that has more potential to develop and grow. In some advanced patients, although eggs can be obtained, the success rate is low because the eggs are of poor quality and cannot form good embryos. A good uterine cavity environment, especially the endometrial environment, provides suitable soil for embryo implantation facilitating further embryo growth. Therefore, uterine polyps and submucosal fibroids, which may affect the endometrial growth, should be removed before embryo transfer to improve the embryo implantation rate.