The work characteristics of LD double-end-pumped laser are studied.Taking the rectangle crystal as the research model of solid-state lasers,and combining the management mode of the heat capacity laser,the working stage of the laser is divided into the pumping phase and the cooling phase,then the corresponding thermal models are set up.According to the equation of heat conduction and boundary conditions,the equation is solved,and the temperature field expressions of the pump phase and the cooling phase are gotten.The influence of the different spot radiuses and pumping time on the crystal temperature field is analyzed.The calculating results show that when LD with the pump power of 60 W,the super-Gaussian radius of 800 μm,and the super-Gaussian order of 3 pumps the crystal,the maximum temperature rise of the crystal is 201.30 ℃at the pump end.The rectangle laser crystal has a size of 20 mm×20 mm×10 mm,and an absorption coefficient of 910 m-1 for pump light,and its neodymium-doped ion is 1.0 at%. The calculated results are helpful for the optimization design and experimental study of LD pumped solid-state lasers.