Abstract: In order to deal with issues of over-sizing and single mode of frequency reconfigurable antenna in the system of ultra-wide band (UWB), a reconfigurable as well as multi-modal frequency UWB antenna with band-notched features is presented in this article. By adding T-shaped knots, etched I-shaped groove, and inverted U-shaped groove into radiation patch of circular mono-pole, the antenna can get wide impedance bandwidth of UWB ranging from 2.7 GHz to 11.6 GHz. And then four kinds of trap bandwidth will come into being. It has been shown by simulation and practical data that: the control of offset starts in PIN diode can make it possible to switch under eight multimoding conditions among five frequency bands including single-band, dual-band, tri-band, four-band and five-band. The size of antenna mentioned above is 16 mm×19 mm with a reduction of over 40% in volume comparing to the mono-pole, thus realizing the miniaturization. The maximum gain of antenna is 4.13 dBi with better radiation characteristics.