Organic pigments Hansa Yellow (P.Y.3), Sudan Black and right stabilizer were selected to prepare a new kind of electrophoresis. The stability was improved by adjusting the quantity of every component in the electrophoretic suspensions. The charging mechanism of the pigment and the influencing factors were analyzed. The change of the reflectivity and absorption spectrum with voltage direction was studied. Spectral analysis indicates all kinds of absorption confines the display effect. The absorption spectrum shows coherence with reflection spectrum about the display character. The reflection intensity of pigment as well as reflectance, contrast ratio, is different at different wavelength, which determines that a proper light source and radiating wavelength should be selected to monitor the response of display model to the added voltage pulse. In view of both sensitivity and signal intensity, Flurolog-3 fluorescent spectrometer was used to monitor reflection intensity change with pulsed voltage of different period and amplitude at the wavelength of 493 nmwith a 470 nm blue light emission diode as light source and the thickness of the electrophoresis tank as 0.2 mm. An oscillograph was used to to record the change of reflection intensity with driving voltage. At last, the influence of driviing voltage on reflection intensity and response speed is theoretically analyzed.