In order to improve the beam quality of laser diode (LD) side-pumped solid laser and increase the efficiency of mode TEM00,a ring LD arrays (LDA) non-uniform pumping mode was reported. Two crisscross semicircular LDA were used to side pumped two laser rods and were cooled by heat conduction at the other face. The optical rays from LDA were regarded as Gaussian beam approximately. With computer modeling in the conveyable regulation of Gaussian light,the pumping uniformity characteristics in crisscross semicircular LDA non-uniform side-pumped Nd:YAG laser were studied. The influences of pumping uniformity was analyzed at different distances and absorption coefficients.