The coating for cockpit glass is one of the important ways to realize aircraft stealth technology. In order to study the stealth characteristics of Nb-doped ITO (Indium Tin Oxides) coated glass, the definition of RCS (Radar Cross Section) mean gain is proposed, and when the gain increases, the stealth characteristic is reduced. A series of RCS darkroom tests are carried out for Nb-doped ITO coated glasses with different sheet resistance, and the electromagnetic scattering characteristics with different incident frequencies and polarization modes are analyzed. It’s found that, when the sheet resistance increases, the electromagnetic scattering decreases, and the appropriate sheet resistance (less than 40Ω/m2) is beneficial to realize the shape-stealth of cockpit, and its scattering characteristic is also close to the metal’s, the peak of specular scattering is narrow when the frequency is high.