Internal jugular vein (IJV) catheterization is a common clinical technique for fluid or drug administration, as well as for central venous pressure (CVP) measurement. The optimal depth of the IJV catheter varies with the children's height and weight. This paper describes the suitable position of the catheter tip and introduces the main methods to determine the position of the catheter tip, such as transesophageal echocardiography (TEE), transthoracic echocardiography (TTE), chest radiograph (CXR) and intracanal electrocardiogram. Besides, ways to determine the appropriate depth of IJV catheters on the right or left side and depth of catheter in special populations are reviewed in this paper. There are some formulas to calculate the depth of IJV catheters. Considering the individual diversity of children, its applicability to individuals needs further clinical examination.