A numerical model of the rod laser medium end-pumped by laser-diode array (LDA) is set up.Under considering the influence of temperature correlation of the thermodynamic parameters of the material and heat transfer coefficient between air and medium,based on the thermal conduction equations and the thermal-elastic equations,the transient distributions of temperature and thermal stress and strain in the rod medium are calculated by a finite element analysis method.The influence disciplinarian of the pump power on thermal lens focal length in the medium is analyzed.The theoretical results accord with interrelated experiment and provide theoretical reference for the design of solid laser pumped by LDA and experimental study.