Through-wall imaging is one of the applications of Ultra Wideband communication that attracts recent interests for its ability to penetrate the wall. However, the available references fail to provide a clear feasible imaging method. This paper proposes a novel virtual elliptic curve imaging method based on the UWB pulse system, which presents the detail imaging process and imaging results. The key factor of this method is to correctly obtain the propagation delay by the correlator, and it is achieved by the spread gain of the pseudo-noise sequences. The imaging results show the proposed method has very high imaging resolution. And the error analysis is investigated on account of misestimating wall parameters. Simulations illustrate the effects of the errors under different scenarios.