Band-pass filtering characteristics of W-type dispersive fiber are studied by combining online filtering dispersive optical fiber with W-type fiber which is long wavelength cutoff. A band-pass filter can be achieved by appropriate structure composed of SiO2 core, SiO2-F inner cladding and SiO2-B2O3 outer cladding respectively. According to finite element method simulation and numerical calculation, energy loss of fundamental mode and energy distributions at some wavelength of the stopped band or passband can be obtained, and the cutoff wavelength and bandwidth can be adjusted by controlling the dopant concentration and structure parameters. The influence of the core radius and the central air hole on the filtering performance is analyzed. The results show that decreasing the core radius or enlarging the air hole will reduce bandwidth and increase the passing band edge steepness.