Abstract: The planned G4218 Kangding-Xinduqiao Highway traverses the Zheduotang Section characterized by complex geological conditions and prevalent debris flow activity. This section includes 23 debris flow gullies. 2 routing options, K-line and N-line, have been proposed. Through extensive field investigations and analysis of these gullies, eight influencing factors were selected, including the average longitudinal gradient of the main channel, the incising density of watershed, the density of fault line, and the average monthly precipitation during the rainy season. An assessment model was constructed using the Analytic Hierarchy Process-Entropy method to classify the hazard levels of each gully and propose route selection recommendations based on the evaluation results. The results indicate that high and extreme risk areas for debris flows in the research area were mainly concentrated on the right bank of the lower Zheduo River and both sides of the upper reaches of the Yulin River. The K-line scheme is more advantageous than the N-line due to its shorter route through high-risk and extreme-risk areas, as well as a lower level of complexity at the site location, based on comprehensive proportional analysis. The research provides a scientific basis and technical support for traffic engineering geological route selection in western mountainous areas.