Background: The difficult airway is a challenge in clinical anesthesia. Stylet has been used to help anesthetists approach the trachea easier. However, by using a traditional stylet, the views of larynx are sometimes not clear enough to distinguish the trachea from the esophagus. It leads to false intubation. Objectives: This research aims to develop an economical borescope stylet that can be used safely in difficult intubations and satisfy the anesthetists. Materials and methods: The modified borescope stylet used a 5.5-mm borescope camera, then the recorded images of glottis in real-time space are transferred to a smartphone screen. The product was tested successfully in two stages of modeling and clinic examination under the permission of the Board of Science and Technology at Can Tho City General Hospital. Results: 32 patients who needed general anesthesia for operation and predicted difficult intubations were intubated using the modified borescope stylet. This device provided successful intubation rates of 87.5% cases in first access, 12.5% cases in second access, and none of the cases could not be intubated. The average time to complete successful intubation using the device was 44.69 (15 – 90) seconds. Importantly, the larynx of patients was not completely injured after intubation using the device. 100% anesthetists were satisfied with the modified borescope stylet. Conclusions: The modified borescope stylet was developed successfully. It worked safely, satisfied all the anesthetists, possessed as an advanced device with easy and shorttime operation and met all the requirements of DAS 2015.