The absorbed light field distribution model of laser crystal of the LDA pumped solid laser structure is established,the normalization distribution morphology of absorbed light field is calculated by MATLAB. Two important parameters are presented such as array tangential displacement and radial angle deviation. The simulation results show that the parameters such as relative absorption strength and light field uniformity of the crystal are nearly invariant when array tangential displacement is 0~0.5 mm; when array tangential displacement is greater than 0.5 mm,absorption strength rapidly decreases,and light field uniformity rapidly increases. Compared with array tangential displacement,radial angle deviation has less effect on the absorbed light field distribution,absorption strength decreases and light field uniformity increases with radial angle deviation increase. This study provides theoretical direction for the development of LDA side pumped laser crystal.