A two-dimensional photonic crystal waveguide using metal is designed. The transmission characteristics of TM wave in three kinds of two-dimensional 90? bend waveguides are investigated by using the finite difference time domain (FDTD). The curves of transmission efficiency changed with the period at an appropriate filling factor are given. Finally, the best structure among the waveguides is further optimized to have a bandwidth of 99 nm at 3 dB and a transmission efficiency of 98.2 % at the target wavelength. The lattice constant α and the diameter of the metal pillar R in the structure are 1.190 μm and 0.809 μm respectively.