Ultrasound can examine a wide range of items, and almost every system in the body can be examined with ultrasound. When patients are uncomfortable, they can do ultrasound examinations according to the location of the disease. Commonly used ultrasound examinations include 1. abdominal ultrasound (liver, gallbladder, pancreas, spleen, kidneys, ureter, bladder, prostate, seminal vesicle, uterine adnexa, fetus, appendix, and gastrointestinal tract) 2. cardiovascular system examination (heart and large blood vessels, neck vessels, and blood vessels of the extremities) 3. superficial system examination (thyroid, breast, lymph nodes, and superficial tissue masses) 4. intracavitary ultrasound (transvaginal, transrectal ultrasound, transesophageal ultrasound, etc.) 5. 5. musculoskeletal system examination (nerve, muscle, bone) 6. other examinations (intraoperative, positioning, lung, etc.) Color ultrasound is widely used in clinical practice and is the most basic examination and diagnosis method. Color ultrasound can visually see whether the location, size and shape of the examined organ are normal, and also clearly show the adjacent relationship with the surrounding tissues, and most importantly, it can check whether the tissues and organs have abnormal occupying conditions. Most importantly, it can detect whether there is any abnormal occupancy in the tissues and organs. Moreover, experienced ultrasound physicians can identify the benign and malignant nature of the occupancy. Ultrasound can check a wide range of contents.