**2. Methodology**

This chapter provides a retrospective summary of the key technologies of our self-developed computer-assisted surgery system "Hisense CAS" and analyses its practical application in pediatric oncological surgery, providing individualized computer-assisted surgical planning for common and complex pediatric tumors (such as malignant tumors of the liver, retroperitoneal tumors, and mediastinal tumors) to improve tumor resectability and reduce surgery-related complications [5, 6].
