Objective To investigate the immunomodulating effects of yiqijiedu formula on RAW264.7 cells and its possible mechanisms. Methods RAW264.7 ceils were treated with different concentrations of yiqijiedu formula,cell proliferation was measured by MTT assay; concentration of tumor necrosis factor-α(TNF-α) ,interleukin-12 (IL-12) and nitric oxide(NO) were determined by ELISA method; production of NF-κBp65 protein was detected by Western blot. Results Yiqijiedu formula( 10-320 mg·L^-1 )possessed the stimulation effect on macrophages proli...