In this paper

wavelet-method of moment （Wavelet-MoM） is applied in solving elecric field integral equations（EFIE）.Accuracy

sparsity and condition number of the expansion matrix are analyzed

comparison with the general used subdomain moment is made. The results show that Wavelet-MoM leads to a sparse expansion matrix

with a higher condition number as its cost. We analyze the sparsity principle and give an explanation to the mechanism of higher condition number. At last

a numerical example is presented to verify our conclusions.