At present, Some devices based on subwavelength metallic structures and working in microwave regime have been designed due to the special optical properties of subwavelength artificial materials. However, in terahertz (THz) regime, because of the small size and the limit of source and detection of THz wave, THz functional devices develop slowly. For developing THz filters, by finite-difference time-domain (FDTD) method, the optical properties of an array of subwavelength metallic bars′ combinations are studied in this article. The results show that several absorption peaks appear in the transmission spectra when a unit cell of the structure contains several bars. So, multi-band filter can be made on the basis of the property. In addition, by changing the structure, wideband filter can be realized in THz regime.