Purpose: Vascular crisis still represents the most common complication in free flap transfer in oral and maxillofacial and head neck reconstruction.The aim of this retrospective study was to represent medical information of patients with vascular crisis of free flap reconstruction.Methods: We examined the data of 56 patient cases of vascular crisis in the patients undergoing free flap reconstruction with a microsurgical flap in our department between 2007 and 2012.We represent medical data such as results of exploration,type of vascular crisis,initial symptom,response date of vascular crisis after operation.