A new method to design wide band bandpass filter (BPF) with harmonic Suppression is presented in this paper. The T shape multiple-mode resonator (MMR) is employed to realize the wideband bandpass response with one transition zero outside the passband. The better out of band suppression is achieved by adopting the new feeding structure. The feeding structure introduces a new resonate mode, which provides additional transition zero at upper stop band to realize better harmonic suppression. After wards, a microstrip filter is designed for verifying the feasibility of the design method.