The purpose of this study is to determine whether Healing stone navel belt is safe and effective in the treatment of Primary Dysmenorrhea.

Inclusion Criteria:

• Age : female adults aged 15~45 years
• Subjects should diagnosed as primary dysmenorrhea, should have a primary dysmenorrhea at least a 1-day during menstrual.
• Subjects should have 21~42 days menstrual cycle.
• menstrual pain : primary dysmenorrhea at least a 1-day during menstruation is over 5 VAS(Visual Analogue Scale) without drug.
• Subjects must have no Serious internal medicine.
• Subjects must provide signed informed consent prior to participation in any study-related procedures

Exclusion Criteria:

• Subject that oral contraceptive taken within 3 months
• Pregnancy or lactation.
• Subject have contraceptive that secrete hormone.
• Secondary dysmenorrhea
• pelvis inflammatory disease patient
• Other diseases or characteristics judged by the investigator to be incompatible with the assessments needed in this study or with reliable instillation of the study.