Stimulated Raman scattering (SRS) is an important nonlinear process in optical fibers that can realize the MIR wavelength shift from our existing pump source. In this paper, we experimentally investigated an efficient 2.19-and 2.42 μm cascaded Raman pulse fiber laser that was composed of 2 μm electronically modulated pulse source, one typically three-stage Tm-doped fiber amplifier and a segment of commercially nonlinear fiber. A simple single-pass configuration was built to avoid the bandwidth limitation of optical components for Raman pulse generation at longer wavelengths.