Objective: To observe the effect of PenQiangYan Granule on the chronic pelvic inflammatory disease(PID), PenQiangYan Granule which didn't stop to be used in menstrual period and to explore their mechanism. Methods: 90 patients were divided into three groups randomly :the treatment group I ,the treatment group II and the control group. Symptoms and signs of each group were observed before and after treatment, Meanwhile the levels of CDs, CD4, CDg, TNF- a and IL-2 of the blood plasma were measured...