Objective: To study the influence of negative electrets on transcutaneous permeation of methyl salicylate through rat skin in vitro . Methods: The penetration flux of methyl salicylate through rat skin in vitro was performed by high performance liquid chromatograph (HPLC) and improved Franz diffusion cells. Results: The penetration flux of negative electrets group was 1.55 times higher than that of control group ( P <0.05). Conclusion: Negative electrets can enhance methyl salicylate delivery throu...