Based on an erbium-doped dispersion-managed fiber laser, the characteristics of noise-like pulses under different net cavity group velocity dispersions (GVDs) are experimentally investigated. Results show that the spectral bandwidth of noise-like pulse will increase as the net cavity GVD increases and attains maximum when the GVD is slightly positive. The effect of Raman scattering is enhanced due to the temporal width attains minimum. When the net cavity GVD increases continually and further into the positive region, the spectral width begins to decrease and the effect of Raman scattering is suppressed due to the positive dispersion. Our experimental results are in good agreement with the previous prediction of numerical simulation.