It is not possible to generalize whether it is better to do B-ultrasound or color ultrasound, as the principles of both are slightly different, and the accuracy and applicability are also different. 1. B-ultrasound: If it is an early pregnancy test or morphological and pathological examination of the uterus, ovaries, pelvis and other parts, you can choose B-ultrasound, which is not only cheap and low radiation, but also can differentially diagnose early ectopic pregnancy, early endometrial lesions and other diseases. The test results are more accurate. Before the examination, it is necessary to drink a lot of water and hold urine, so that the bladder is in a full state, which can improve the accuracy of the examination; 2, color ultrasound: if you want to clarify whether there is a swelling in the pelvis, it is better to choose color ultrasound examination, because color ultrasound can observe the blood flow supply in the tissues and organs, which makes the examination images clearer and can improve the accuracy of the detection results, and there is no need to hold urine before the color ultrasound examination, but it is expensive and the radiation is slightly larger than ordinary However, it is more expensive and has slightly more radiation than normal ultrasound. The former can observe whether the fetus, placenta and amniotic fluid are in accordance with the gestational week and whether there is intrauterine growth retardation, while the latter is mainly used to observe whether there is abnormal blood flow in the uterus and ovaries of women, so as to determine the situation of gynecological tumors.