Objective To investigate the application of a new delivery balloon dilation catheter (Fastunnel catheter) in the interventional treatment of intracranial atherosclerotic stenosis. Methods From Nov. 2022 to Feb. 2023, 10 patients with intracranial atherosclerotic stenosis were treated with balloon dilatation and stenting using Fastunnel catheter in our center. The application value of Fastunnel catheter was evaluated by collecting and analyzing the baseline information, imaging characteristics, treatment, and perioperative complications of the patients. Results There were 6 males and 4 females, with an average age of (62.7±6.7) years old. All the 10 patients were successfully treated with surgery. The operation duration was 16-65 (37.3±18.2) min, the radiation exposure time was 9-23 (15.9±4.7) min, the radiation dose was 1 381-4 901 (2 643.7±1 131.7) mGy, and the dose area product was 5 707-38 112 (17 526.8±10 809.5) μGy·m². None of the 10 patients had bleeding- or ischemia-related complications during the perioperative period. Conclusion Fastunnel catheters have good safety for intracranial artery stenosis, can effectively simplify the operation procedure, and have advantages in shortening the operation time and reducing the radiation exposure of doctors and patients.