The aim of this study was to evaluate results of our surgical treatment of advanced neoplasms of the floor of the mouth, treated from 2005-2011 in Department of Otolaryngology and Department of Plastic Surgery Medical University of GdańskWe analyzed group of 12 patients (aged 36 to 70 years, mean 55) treated by primary surgical excision of neoplasms of the floor of the mouth (with tracheotomy and mandibulotomy) and selective or radical neck dissection (uni- or bilateral) in combination with chemoradiotherapy. All patients referees with advancement of locoregional disease: primary tumors (T3 or T4) and neck metastases (N1 or N2b) Most of the patients required to use free microvascular reconstruction with free forearm skin flaps. Histological examinations revealed squamous cell carcinoma (11/12) and adenocarcinoma (1/12).Two patients die in 1 and 4 months after surgery. Three die from 2 to 3 years after surgery. Rest live from 6 month to 6 year after therapy.Free forearm skin microvascular flap is good (anatomical and functional) for reconstruction for large defects after resection neoplasms of the floor of the mouth.