Objective To obstor.e analgesic effect of cancer pain by radiation of acupoint with HPD millimeter-wave. Methol One 100patlents with serious cancer pain were treated by HPD millmeter-wave instrument (MW group) 30 minuies each time once a day. The radiatnt heads were put on the acupoints according to channeis. 40 patients with serious cancer pain accepting drug treamtment as control groud. The patieuts were evaluated one week after the treatment. Result Pain was signficantly relieved in 27 patients(27%)and decreased in 40 cases(40%) in millimeter wave group. Total analgesic rate was 67% (67/100)in MW group. Pain was relieved in 4 cases(10%) in control group(P＜0.001) Conclusion Radiation of acupoint with millimeter-wave is a safe, effective, and prompt method for cancer pain.