Complication, residual AVMs rates were analyzed as well. Conclusion: Frameless stereotaxy allows surgeons to 1) plan the optimal trajectory toward an AVM, 2) minimize the skin incision and craniotomy sizes, and 3) define exactly the feeding vascular of AVMs for temporary clamp or handle these vasculars to decrease the intraoperative blood loss, 4) confirm the AVM margins and identify deep vascular components during resection, 5) evaluate the interaction between AVM and cerebral structure around especially in the eloquent function and operation areas.