The study is by means of SEM results on cross-section of fiber to observe the micro pores caused by surface finish. Then finding the micro pores according to the analysis of Image-Pro and Suffer, and demonstrate the clearest picture of the micro pores using enhancing tuning of contrast and brightness, especially the boundary of micro pores. Finally evaluate the range of micro pore's size and depth caused by fiber failed in 3D figure, The depth of Polyester fiber is 0.86604~0.93886μm under 350Vx20S microwave destruction, 0.779976~0.953304μm for 350Vx40S, 0.68609~1.0833μm for 350Vx50S. And the depth of fiber radiated by 700KVx7Mrad electric beam is 0.28507894~0.57015789μm.
