A novel S-shaped electromagnetic band gap (EBG) ultra-wideband band-pass filter based on substrate integrated waveguide (SIW) is proposed. The filter is designed based on the band-stop characteristics of EBG and can obtain ultra-wideband by etching different dimensional S-shaped on the surface of substrate integrated waveguide .The designed band-pass filter with a center frequency as 9.03 GHz and relative fractional bandwidth 26.14% shows good band-pass characteristics with the frequency band between 7.85~10.21 GHz while the insertion loss is less than 1.54 dB and still the designed filter has the advantage of narrow band-pass, low insertion loss, compacted and good selectivity etc. that's better than the results in the referrence［8~10］.the good agreement between the measured results and the simulated results demonstrates that the design of this proposed filter is effective.