Deep vein placement refers to the placement of catheters into deep large and central veins through superficially located veins. Central venous cannulation is often used for various resuscitation and major surgeries, especially cardiac surgeries that require long-term monitoring of medications, blood draws, and laboratory tests; continuous hemodialysis, prolonged blood transfusions, fluid infusions, and prolonged medications. Deep vein placement is important to ensure that critically ill patients require various laboratory tests such as blood gas and electrolytes, monitoring of central venous pressure, and safe and effective medication administration. Deep vein placement is very important to ensure the rescue, treatment and monitoring of critically ill patients, and it is significant to improve the success rate of rescue.