In simple ectopic pregnancy, the sign of the gestational sac cannot be seen in the uterus, but it can be manifested as endometrial metaplastic changes, that is, thickening of the endometrium, uneven echogenicity and metaplastic changes, and the key must be to find the pregnancy mass outside the uterus. For ectopic pregnancy masses, some are typical and some are not. In typical ectopic pregnancy masses, the signs of intrauterine pregnancy can be seen outside the uterus, with the expectant sac, germ and heart tube. If this is seen, the diagnosis of ectopic pregnancy can be made with relative certainty. However, in most cases the typical signs are not seen. When the typical signs are not seen, it is important to look at the echogenicity of the inhomogeneous mass, which in ectopic pregnancy is not particularly large in the absence of bleeding. In atypical ectopic pregnancies, although the typical expectant sac is not visible, the trophoblastic spectrum can sometimes be seen, and this trophoblastic spectrum manifests itself as a more bizarre blood flow spectrum. If the mass is combined with bleeding and interspersed with pregnancy, it appears as a very heterogeneous and irregularly shaped mass, in which case the patient will tend to have a large number of dark areas of poorly transmissible fluid in the pelvis. The ultrasound diagnosis of ectopic pregnancy must be based on whether the ectopic pregnancy has ruptured and whether there is a typical gestational sac, etc. For the ultrasound diagnosis of ectopic pregnancy, if the gestational sac and germ can be seen, the diagnosis of ectopic pregnancy can be made clearly; for ectopic pregnancy that is not particularly clear and atypical, the diagnosis must be combined with the relevant clinical indications.