A novel optical soliton compression technique based on step-like nonlinearity profiled fiber is proposed. The step-like nonlinearity profiled fiber is composed of single mode fiber (SMF), dispersion-shifted fiber (DSF) and high nonlinear fiber (HNLF). All the components used in the simulation are available in reality. Compared with other soliton compression techniques, this method is easy to control and its cost is low also. It is shown in numerical simulation that a hyperbolic secant pulse, whose width is 12.5 ps and peak power is 300mW, can be compressed to a 1.28 ps-width, 1.3 W-peak power pulse by using this step-like nonlinearity profiled fiber transmission line.