• Aged from 18 to 80 years, male or female;

• Patients diagnosed as intracranial aneurysms by brain CTA/MRA/DSA;

• Patients with unruptured saccular aneurysms or fusiform aneurysm who are clinically determined to use flow modulation device for endovascular treatment;

• The diameter of the target aneurysm parent vessel was 1.75-5mm;

• Patients target aneurysm is planned to be embolized using flow modulation devices only;

• The mRS Score of the patients was 0-2

• Patients understand the purpose of the study, accept the follow-up period, and agree to comply with all requirements, agree to participate in the clinical trial and voluntarily sign the informed consent.