e14701 Background: To investigate the application value and strategies of ultrasound-guided percutaneous radiofrequency ablation (RFA) in treating advanced hepatocellular carcinoma (HCC) which is common in china. Methods: A total of 655 patients with unresectablely advanced HCC underwent percuatenous RFA therapy and 92 patients with 136 tumors among them were enrolled into the study. According to the 6th UICC/AJCC-TNM system, 82 and 10 patients were in stage III and IV, respectively. The tumor size ranged from 1.5 to 8.0 cm (mean±SD, 4.5±1.6 cm). 59 patients had solitary tumor and the remaining 33 patients had multiple tumors. The Child-Pugh classification of A, B and C were 58,32 and 2 patients, respectively. Established strategies included: (1) select RFA indications based on the contrast-enhanced ultrasound (CEUS) results; (2) design radical protocols based on invasive range showed by CEUS; (3) multiple overlapping ablations based on mathematical protocol; (4) two or three bipolar RFA electrodes with three dimensional localization; (5) color US guided percutaneous ablation of tumor feeding artery (including TACE) + RFA for HCC with rich supply. The patients underwent follow-up using enhanced CT at one month, and then every three months after RFA. The ablation was considered a success if no abnormal enhancement or wash-out was detected in the treated area on the CT scan at one month. All patients after RFA received liver protection treatments. Overall survival was estimated by Kaplan-Meier analysis. Results: Early complete tumor necrosis rate after initial RFA was 90.4% (123/136 tumors). Serious complications were developed in two patients (2.2%) and no treatment-related death occurred. 3~129 months were followed up. Local recurrence rate was 15.4 %(21/136 tumors). The 1-, 3-, 5-year overall survival rates were 83.3 %, 48.3 %, 21.9%, respectively, and the median survival time was 35 months. Conclusions: RFA treatment of advanced HCC proved to be feasible. Paying attention to apply treatment strategies and liver protection therapies in RFA can effectively improve the survival.