It is clearly that both the thickness of membrane and color changes increased with spinning time increase. Though the thicker membranes would enhance the strength of paper, the color changes is too large for 11.83 if we keep spinning for 5 min, which for ebodesan even larger color change if using in paper relics whose color are usually yellow or brown. In order to make a balance, we fixed the spinning time to 3 min in later experiments. Fig. 2 shows the SEMc ross-section photograph of paper sample protected by PVDF fiber membranes spinning for 3 min. We can see that PVDF fibers areevenly overspread paper surface to form an ultrathin protective layer.