Primary dysmenorrhea (PD) is a common complaint in menstruating women. Although nonsteroidal anti-inflammatory drug is an effective treatment, there are concerns about serious adverse events. Complementary therapies, including acupuncture, are commonly used for PD. Acupuncture has a low risk of adverse effects, while the evidence for the effectiveness of acupuncture in treating PD is inconclusive. Deqi and psychological factors are core concepts in acupuncture theory, but they have been largely neglected in primary dysmenorrhea clinical reports. The objective of this trail is to assess the clinical efficacy of acupuncture in the prevention of PD and investigate what factors will affect the efficacy of acupuncture.The results of this trial will significantly add to the current body of evidence on the role of acupuncture for PD. If found to be effective and safe, acupuncture will be a valuable treatment option in the prevention of PD. In additional, results from this trial will identify what factors will affect the efficacy of acupuncture.