The casting process of Sanxingdui bronzes is always a hot topic in academic circles. It is unique and distinctive in spite of its close link with the techniques of the central plains and the middle and lower reaches of the Changjiang River. The analysis using X-ray CT scanning and non-destructive testing has gained more knowledge about the internal structure of the Sanxingdui bronzes and the technological application of core rod and strip chaplet. It works as the advanced casting process of that time to make a significant difference in technology between the bronze products of Sanxingdui and anywhere else of the same age, reflecting the technological and cultural context where the Sanxingdui bronzes come into being.