High-peak-power, high-beam-quality 1550 nm laser are widely used in biomedical, material processing and environmental monitoring. In this paper, an eye-safe pulsed fiber laser based on a main oscillator power amplifier (MOPA) is reported. The output peak power of 12.2 kW is achieved successfully. The optical conversion efficiency is 17.7%, the central wavelength is 1549.884 nm, and the line width of 3dB is 1.182 nm, the frequency of the light is 50 kHz and the pulse width is 6.146 ns, the beam quality is 1.11. In addition, this paper has carried on the engineering design of the eye-safe pulsed fiber laser to enhance its tolerance to environmental changes, thus further improving its application potential.