Posterior herpetic neuralgia, defined as lasting pain more than one month after healing of herpes zoster, which is the most common complication of herpes zoster, and the incidence rate is the highest among the elderly population. In order to further understand the causes, pathogenesis and treatment of postherpetic neuralgia of the elderly patients, we reported a 84-year old patients with postherpetic neuralgia within three months was treated at Shiyan people's hospital by fentanyl transdermal plaster+sacral block+intradermal sensory block, and the pain symptoms were disappeared. The treatment experience may provide an evidence for clinical workers for Posterior herpetic neuralgia treatment.