Abstract: Objective:To evaluate the accuracy of the application of color Doppler sonography (CDS) and computer tomography angiography (CTA) in preoperative perforator identification and flap design and provide theoretical support for the restoration of oral maxillofacial defect with free superficial circumflex iliac artery perforator flap (SCIAPF).Methods:(1) Preoperative CDS and CTA techniques were performed to map the SCIA perforators of 29adult patients diagnosed with malignant tumor in the oral maxillofacial head and neck regions. These patients were scheduled for concurrent reconstruction surgery. ( 2) A diagnostic test was designed to com-pare the CDS and CTA techniques.Results:(1) A total of 18patients underwent flap preparation. SCIA was not found in one of the pa -tients during surgery, but was observed intra-operatively in the other 17patients. The average SCIA diameter was 0.69± 0.20mm. (2) The diagnostic test showed a CDS sensitivity of 75.0% , a CDS specificity of 82.4% , and an area under the ROC curve of 0.79. The CTA sensitivity was75.0%, the specificity was94.2%, and the area under the ROC curve was0.85. The diameters measured by CDS and CTA were compared with the diameter measured intra-operatively. Significant differences were observed among the three diame -ters (P<0.05). The average diameter measured by CDS was 0.84± 0.14mm. The average diameter measured by CTA was 1.01± 0.19 mm. Conclusion:CDS and CTA are relatively reliable technologies for preoperative detection of perforator vessel. The use of CDS and CTA technology mapping for SCIAPF can provide accurate information about the perforator, including the position of the perforator and the relationship between the peripheral tissues and the caliber of the vessel.