The gallbladder is a pear-shaped cystic organ, about 5-8 cm long and 3-5 cm wide, with a large variability and a capacity of 30-60 m1, which can store and concentrate bile, and is attached to the fossa of the liver by loose connective tissue and covered with peritoneum underneath, so it can move with the liver with breathing, especially when the gallbladder lesion is enlarged, which is easy to find during physical examination. The gallbladder is above the liver, below the posterior is the duodenum and transverse colon, the left is the pylorus, the right is the colonic hepatic flexure, and the anterior is the anterior abdominal wall. It is divided into four parts: base, body, neck and duct. The bottom part protrudes slightly from the lower edge of the liver, and the body part is located between the bottom and the neck, which is more stretchable. The neck is curved and thin, with a deeper position, and its beginning is dilated to form the Hartmann’s cyst, where gallbladder stones mostly rest. The cystic duct is 1-5 cm long and 0.2-0.4 cm in diameter. One end is attached to the neck of the gallbladder and the other end joins with the common hepatic duct to form the common bile duct. The standard during ultrasound examination is that the long diameter of the gallbladder does not exceed 9cm, the anterior-posterior diameter does not exceed 3.5-4cm, and the wall thickness is 2-3mm, which is normal. There are some individual differences in the size of the gallbladder, but if a significant increase or decrease in the size of the gallbladder is found during the examination, it indicates that the gallbladder may have pathological changes, which should be taken seriously enough to seek medical attention in time to identify the cause and scientific diagnosis and treatment to avoid delaying the disease.