In order to improve the control of large unresectable(>6cm) and fixed N3(TNM-UICC) metastatic neck nodes, local hyperthermia(HT) has been combined with radiation therapty (RT) in Yonsei cancer center. From April 1985 to april 1988, a total of 18 patients of head and neck cancer with metastatic large unresectable and fixed cervical neck nodes who underwent combined RT and HT were analyzed. Of 18 patients, complete response rate was 39% (7 pt.) partial response 39% (7 pt.) and overall response rate was 78%. Acute side effects of these combined modalities were found in 8 patients and which were mainly cutaneous reaction such as erythema, dry and moist desquamation but recovered spontaneously in all patients after treatment. Factors of maximum tumor temperature above $43^{circ}C$ and MDF(multiple daily fractionation) showed more favorable response rate but not statistically sinificant. Two year actuarial survival rate of all patients was 35.4%.