A high-beam-quality and high-stability all-solid-state Nd:glass amplifier with laser diode(LD) side-pumping applied to amplify a nanosecond laser pulse source has been developed in this paper.The maximum output energy can be obtained when high-gain components with serial two-pass LD pumping amplification are used.On the other hard,the liquid crystal spatial light modulator(LCSLM) is used to produce a particular spatial distribution in the near field to pre-compensate the gain uniformity of the latter amplifier in order to get high-quality spot.The operating wavelength and frequency are 1 053 nm and 3 Hz,respectively.When the amplifier is seeded with a 1 nJ and 3 ns flattened pulse,the output energy is 100 mJ with beam spot of 10 mm×10 mm,energy instability less than 2%(root-mean-square),net gain more than 109.The modulation in the near field is less than 1.3∶1,the diffraction limit of focus spot in the far field is less than 2DL,and the far field angle shift is less than 9.5 μrad.