Cross‐correlation of Cosmic Microwave Background (CMB) and large scale structure survey is one of the powerful tools for constraining the nature of dark energy through the so‐called Integrated Sachs‐Wolfe effect. However, CMB from higher redshift is the dominated noise of this effect. Here, we present the CMB polarization‐assisted method to suppress this noise. We apply this method to cross‐correlation of the microwave sky observed by Wilkinson Microwave Anisotropy Probe (WMAP) with the radio source catalog compiled by NRAO VLA Sky Survey (NVSS) to study the efficiency of the noise suppression. We find that the spurious correlation is reduced about 2–7%.

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