Objectives: The purpose of this study was to investigate the anti-inflammatory effects of aqueous extract from Cicadidae Periostracum(CP) on the RAW 264.7 cells. Method: We examined the cytokine productions including nitric oxide(NO), interleukin(IL)-1b, IL-6 and tumor necrosis factor-a(TNF-a) in lipopolysaccharide (LPS)-induced RAW 264.7 cells and also inhibitory mechanisms such as mitogen -activated protein kinases(MAPKs) and nuclear factor kappa BNF-kB) using Western blot. Results: CP inhibited LPS-induced production of NO, IL-1b and TNF-a but not of IL-6 in RAW 264.7 cells. CP respectively inhibited the activation of MAPKs such as extracelluar signal-regulated kinase(ERK 1/2), c-Jun $NH_2$-terminal kinase(JNK), p38 and NF-kB in the LPS-stimulated RAW 264.7 cells. Also oral administration of CP inhibited CLP - induced endotoxin shock. Conclusion: our results showed that CP down-regulated LPS-induced NO, IL-1b and TNF-a productions mainly through ERK, JNK, p38 MAPK and NF-kB pathway, which suggest the anti-inflammatory effects of CP.