Yin ultrasound can check ectopic pregnancy, ectopic pregnancy is one of the common gynecological acute abdomen. It has been on the rise in recent years, and the most common ectopic pregnancy should be tubal pregnancy, accounting for 95%-98%, which is very prone to rupture and bleeding, and if not diagnosed and treated in time will lead to serious complications, even life-threatening, so early and rapid diagnosis is of great significance to its treatment and prognosis. Transvaginal ultrasound can improve the accuracy of early diagnosis of ectopic pregnancy, on the one hand, it has the advantage of being more intuitive and clearer than transabdominal ultrasound in observing the fine structure of the endometrium, on the other hand, transabdominal ultrasound can’t easily detect small unruptured masses within 3cm due to the influence of many interfering factors, however, transvaginal ultrasound can be detected as early as possible, so that it can give the clinic an effective reference in time, which will affect the prognosis. Prognosis. The most common ectopic pregnancy is tubal pregnancy, and the key to diagnosing ectopic pregnancy is the presence of an adnexal mass. In addition, transabdominal ultrasound is affected by many interfering factors, such as obesity, scarring, intestinal gas, and increased intestinal contents, which may make it difficult to detect small masses within 3 cm, but transvaginal ultrasound can detect them as early as possible.