Recently, an electronic components in automobiles filed are increased rapidly according to demanding of additional convenience and special function. Because risk of electromagnetic interference among the electronic components is growing, it should be found shielding control system such as shielding cover or filter algorithms. In this study, it was focus on CNT(Carbon Nano Tube) polymer compound for reduction weight instead of metal. The CNT provided electrical conductivity to polymer compound. We considered the application of CNT polymer compound on automobile electronic components as the shielding materials using surface resistance and shielding effect. Injection mold that it is one of the most important processes in polymer compound brings about the change of surface resistance due to CNT re-agglomeration. So, we should control its temperature inside of mold to protect CNT dispersion. Finally, we could know that CNT polymer compound was able to apply as the shielding materials.