Objective： To study the influence of electret field on fibroblast cell cycle and to probe its mechanism. Methods： The effect of teflon (PTFE) electret on the parameter of fibroblast cell cycle with flow cytometry in 2 dimentional dot diagram was studied. Results： (1) After 24 h action of negative PTFE, the cell number in S phase increased. Negative electret could improve cell growth. (2) Negative electret not only enhanced the growth of cells, but also enhanced the apoptosis of cell. (3) After 24 h action of positive electret on fibroblast, the cell number in G1 phase increased, while the cell number decreased in S and G2 phase. Conclusion: Negative electret may improve cell growth. Positive electret could block some cell in G1 phase. So it may restrain the cell growth of fibroblast.