Abstract: Objective To study the application of intraoperative indocyanine green videoangiography in the surgical treatment of intracranial aneurysms to improve the efficacy and safety.Methods We retrospectively analyzed 18 patients harboring 25 intracranial aneurysms.All the patients routinely underwent indocyanine green videoangiography before and after the clipping of aneurysms.According to the result of fluorescent angiography,the clip was adjusted if necessary.Postoperatively,CT was performed to identify whether there was infarction and DSA or CTA were performed to confirm the complete aneurysm obliteration.Results During the operations,aneuryismal neck remnant was found in one ease,parent arteries stenosis was found in two,distal branch stenosis was found in one,and perforating artery occlusion was found in one.Immediately after these findings,the clips were replaced until satisfactory blood flow was restored.Postoperatively,there was no ischemic infarction.Cerebral hematoma due to unsatisfactory clipping of the aneurysm W&S found in one patient and the second operation was pedbrmed to evacuate the bleeding and readjust the clip.Complete clipping and parent bypass vessels were comfirmed by DSA or CTA exams in 16 patients.Conclusion Intraoperative indocyanine green videoangiography is useful to judge whether the aneurysm is completely obliterated,whether the parent and distal artery is stenosis,and whether the perforating artery is occluded.This technique is convenient,fast,and safe.It will play an important role in improving the clinical outcomes of intracranial aneurysm.