Reconstruction of the circumferential defect of the hypopharynx and large defect of oropharynx and oral cavity has been a challenging problem in head and neck surgeon. In dealing with these reconstruction many options are available. Maximization of function with minimization of complications, physiologic sequelae must be considered. During recent 2 years, from August, 1988 till August, 1990 authors experienced ablation and reconstructive surgery with free jejunal transfer for 20 patients of malignant tumor of hypopharynx, oropharynx and oral cavity. In hypopharygeal cancer the total number of patients were 10. Of them 9 patients were treated with total laryngopharyngectomy, neck dissection and reconstruction with conduit graft and 1 patient was treated with partial pharyngectomy and patch graft. Ten patients of oral cavity and oropharynx were treated with composite excision throught mandibulotomy, neck dissection and reconstruction with patch graft. The success rate of microvascular surgery was 100%. One patient died of sepsis associated with abdominal dehescience. All patients except a case of death tolerated the oral diet at the time of dischage(solid 12, soft 6, liquid 1). These results suggests that free jejunal transfer is an excellent, reliable, single staged method of reconstruction for hypopharynx and cervical esophagus, oropharynx and oral cavity.