Multi layer dielectric(MLD) grating is always used to combine multiple channel fiber lasers into common aperture beam.In the experiment,we set up four narrow linewidth pulsed fiber lasers with the average output power of ～100 W and the center wavelength ranging from 1058 nm to 1075 nm.By the use of the Spectral Beam Combination(SBC) system with a MLD grating,the output spectrally combined pulse laser was successfully obtained,featuring average power of 360 W,peak power of 122 kW,pulse energy of 0.36 mJ,combination efficiency of 90%,repetition rate of 1 MHz,pulse duration of 2.95 ns.At maximum combined output power,the beam quality factor M2 was less than 2(M2x=1.93,M2y=1.6).