-This paper study on the the novel octagonal UWB microstrip antenna and do double notches and optimization on it. The antenna covers the bandwidth from 3.1 GHz~10.6 GHz completely and has two band-notches in the frequency ranges of 3.4 GHz to 4.5 GHz and 5.15GHz to 5.75GHz respectively avoiding the interferences of WIMAX (3.3 GHZ ~ 3.6 GHz), C-band radar communication signal (3.7 GHz~4.2 GHz) and WLAN (5.15 GHz ~5.825 GHz). Software simulation results show that the antenna performance is good, and in addition, its features of simple structure and small size are suitable for modern wireless communication systems.