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A master-oscillator power amplifier (MOPA) system based on Nd glass laser with output intensity 5 GW/cm2 is described.The laser operates at IHz with pulse energy up to more than 4mj.The spatial profile is near top hat and diameter is Imm,the temporal pulse shape is Gaussain and pulse width is about hundred picosecond.Frequency doubling efficiency is 37.5％. with 3 mm length BBO crystal,the pulse of microjoule output energy and 527 nm wavelength is achieved and it can be used as the pump pulse in the short pulse optical parametric amplification to decrease the parametric fluorescence influence to contrast of optical parametric chirped pulse (OPCPA) system.