All-normal-dispersion mode-locked fiber lasers can generate high-energy and high-linear-chirp dissipative soliton pulses, so they have attracted much attention. The generation of dissipative solitons is attributed to an integrated result of all kinds of effects in the laser cavity, such as gain, loss, gain saturation, nonlinear effects and filtering. The effect of filter on the performance of output dissipative soliton pulses is detailedly investigated. Numerical simulation shows that dissipative solitons obtained in the fiber lasers with band-pass filter have narrower pulse duration and broader spectrum width than those from the lasers without a filter. Moreover, the establishing time of stable mode locking is shorter. The peak power of dissipative soliton pulses increases with the filter bandwidth decreasing, while the pulse energy almost keeps invariable within certain range of filter bandwidth. But in the limiting case of narrow filter bandwidth, the pulse energy decreases abruptly due to the large induced loss.