Nutritional support is an important part of the comprehensive treatment of critically ill children. Nutritional support methods include parenteral nutrition (PN) and enteral nutrition (EN). Although nutrition support can promote recovery and improve prognosis, it also carries certain risks, including mechanical injury and infection, EN intolerance and metabolic complications associated with nutrition support access. What is the response to the common risks during PN in children? The following will provide detailed answers and treatments for common complications.