Ultrasound-guided Percutaneous Transhepatic Biliary Drainage (PTCD) can improve the condition of liver obstruction, which is usually caused Obstructive Jaundice, the patients are with yellow skin and white eyes. By clearly presenting the internal structure of the liver, using ultrasound, the disease incidence point can be accurately and quickly located, and the surgical process can be monitored in real time and precisely. Compared with traditional X-ray, PTCD has the advantages of simple and int