Abstract: Objective: To explore the physical and mental experience and needs of children with chronic diseases undergoing invasive operation. Methods: Under the guidance of phenomenological methodology, 16 children with chronic diseases who had undergone invasive operation were selected for the purpose of semi-structured interviews. Results: During the invasive procedures, the children had physical discomfort and complex psychological reactions, including pain and position limitation, and complex psychological reactions including tension and fear, loss and helplessness, sadness and depression, trust and anxiety. Children need information and peer support before invasive procedures. During operation, children had the need of comfort environment, respect, communication and distraction. After the operation, the children had the need of information, love and belonging. Conclusion: Nursing interventions should be based on the child's own feelings and needs. Nurses should pay attention to children's own characteristics and preferences, and actively explore personalized nursing care in order to improve the children's experience.

Key words: children; invasive operation; physical and mental experience; needs