Abstract: Endovascular treatment has become the main treatment of cerebral arteriovenous malformations(AVM). Except of the continuous improvement of liquid embolic materials, the development and application of detachable microcatheter is also a milestone in intervention field. Now Sonic and Apollo microcatheter are commonly used in clinic with their own structure and detachable characteristics. Compared with conventional microcatheter, the detachable characteristic improves the safety of the embolism process, allowing longer reflux distance. This advantage benefits the full dispersion of the liquid material in the lesion to achieve better embolic effect.