Using second-order soliton compression effect in 4.28 km dispersion flattened fiber (DFF), the 5.8 ps pulse with the repetition rate of 10 GHz generated from a regeneratively mode-locked fiber laser (RMLFL) was compressed into pulse with pulse-width of 1.74 ps. The compression factor was 3.3. The experimental results agree well with the theoretical results. Compared to adiabatic soliton compression (ASC) based on dispersion decreasing fiber (DDF), this scheme can greatly lower the input power for the same soliton order numbers. Moreover, for the input pulses with different wavelength and pulse width, compression condition can be satisfied by adjusting input power and choosing proper fiber length, which is determined by the non-dispersion-decreasing characteristics of DFF. Despite the compression factor is small, it still meets requirement.