With the increasing application of diode pumped solid-state lasers,t he demand for the output optical field is becoming higher and higher.The absor bed distribution model of laser crystal of the laser diode array (LDA) multiple-side pumped solid laser structu re is established,and the normalization distribution morphology of absorption field is calculated by fini te element method．Two critical parameters are presented,including LDA vertical pitc h (L₁) and radial distance from emission face to the surface of Nd:YAG rod (L₂)．The simulation results show that the parameters of relative absorption percentage and pumping uniformit y in the crystal cross-section are sensitive to the changes of L₁ and L₂．In the Pentagon side pumped solid-state laser,whe n th e other parameters are given,L₁ is within 0.4mm~0.8m m, and L₂ is within 1.8mm~2.4mm.In this range,relative ab sorption percentage and pumping uniformity in the crystal cross-section are sensitive are relatively id eal.Finally,by building a solid-laser test platform,we get the experimental results and verif y the correctness of the theoretical analysis.