The Ultra-Wideband(UWB) printed monopole antenna proposed in this paper is notched in the ground plane and the monopole patch, so that the inner band performance is improved and the bandwidth is further expanded at the high frequency section. The gain of the antenna is improved. The parameters of the antenna are simulated and optimized with HFSS, and the best antenna design is got. The simulated result shows the -10 dB impedance bandwidth of the improved antenna is 2.2-14.6 GHz in contrast to 2.5-7.7 GHz of the initial antenna, as a result, the bandwidth is enhanced by 7.2 GHz. The antenna meets the requirements of the UWB and has good voltage standing-wave ratio performance. Furthermore, good radiation patterns indicate that the proposed antenna is well suited to be integrated within various devices for ultra-wideband application.