With the development of modern medical imaging technology, computer tomography (CT), magnetic resonance imaging (MRI), magnetic resonance angiography (MRA), digital subtraction angiography (DSA) and other ways widely used, more and more intracranial aneurysms were diagnosed. In the imaging methods described above, MRI is a non-invasive diagnostic method for intracranial aneurysm which shows in detail the aneurysm and its relationship to the brain, and it has become first-line imaging techniques in assessment of the patient with suspected intracranial aneurysm. MRA can show the arteries and veins of the brain as well as the aneurysm. Nowadays, MRI and MRA are extensively used in the diagnosis of intracranial aneurysms, intracranial aneurysms after treatment and intracranial aneurysms inflammation. This review describes the advantages of MRI and MRA for diagnosis and describes diagnostic pitfalls.