Color ultrasound examination of gallstones will have a certain degree of error, mainly related to the technical level of the examining physician, the patient’s position, the location of the stones and the volume. Although the color ultrasound examination of gallstones has a certain error, but its accuracy is still relatively high, is the first choice of gallstones examination method. 1. Physician’s technical level: In the clinical ultrasound examination of gallstones, the size of the stones measured by different physicians has a certain error, especially with the level of their technical level has a certain relationship. 2. the patient’s position: because the gallbladder is cystic, in the color ultrasound need to take a different position, from a different direction for the examination, the difference in the position of the measured data is not the same, there is a certain error. 3. The location of the stones: for patients who are thin, the gallbladder is often long and sagging, and the stones at the bottom of the gallbladder are not easy to scan, so it is easy to miss the diagnosis. 4. Size of stones: for larger stones, the diagnosis can be clear, while for smaller stones, the diagnosis may be missed when ultrasound is given. To sum up, although color ultrasound is preferred for gallstones imaging, there may be some errors, and it is necessary for a professional physician to decide whether to give CT and other further examinations for the patient’s condition, so as to clarify the condition.