A coaxialfed monopole antenna printed in glass fiber epoxy resin was designed in this paper. It covers three frequency bands by software HFSS 13.0. And the resonant frequencies were 2.45 GHz、3.5 GHz and 5.55 GHz respectively. The bandwidths were 400 MHz、550 MHz and 800 MHz respectively The return loss reached to 45 dB at 2.45 GHz. The influence of height H1,width W and length R2 on the antenna parameter S11 have been analyzed. The measured result and the simulation result have been compared by the network analyzer. The two are consistent, and proved the the design has a certain rationality.