The influence factors on electromagnetic shielding effectiveness of electric discharge texturing surface were mainly analyzed. In order to study the effect on the surface absorbance by EDM textured surface under big current, small pulse width condition, and to obtain ideally roughening surface to attract wave, the sample processing was carried on the NC electric spark formation processing tool. Using the characteristics of measuring error by equipartition, the reflection intensity of the surface electromagnetic wave was measured and the quantitative analysis of the microwave absorption characteristics of the electric spark texturing surface was carried out by means of the integrated ball suction test bed, and the changes of the experimental data were analyzed by using scanning electron microscope and metallographic microscope. The effects of the pulse width and the peak current on absorbing effect were studied. It is indicated the absorption to electromagnetic waves is affected by the surface morphology; under big current and small pulse width condition, the wave absorption rate increases first and then decreases with the increase of the pulse width; and it increases as the peak current is increased.