Objective To observe the analgesia on adjuvant-induced arthritis(AIA)in rats by acupuncturing the JiaJi acupoint on lower back and its influence on β-endorphins(β-EP)of central nervous system as well as explore the partial central mechanism of electro-acupuncture(EA)analgesia.Methods A rat model of AIA was used in this study.Localized pain thre-shold and volume of voix pedis were taken as indexes to observe the EA analgesia,radio-immunity method to detect the contents of β-EP in spinal cord and hypothalamus...