A new method of heat dissipation in a laser diode end-pumped solid-state laser is proposed, and the heat is dissipated from the pumped end with a piece of diamond disk clinging to the pumped end and from the side surface of the crystal rod. The finite element method (FEM) is used to analyze the effect of heat dissipation, and a comparison is made of the cooling effect of the new method with that of traditional method dissipating heat through the side surface of crystal rod. The results indicate that the heat concentrated in the pumped end of the crystal rod can be efficiently removed by the new method, which greatly decreases the temperature difference in the pumped end, and that the highest temperature point appears inside the gain medium, which lowers probability of break in the pumped end, and obviously reduces the thermal effects of the crystal rod. With the same power injected into the crystal rod, experiments are done to compare the output power of a laser diode end-pumped solid-state laser with the two different heat dissipation methods. The results show that the method of direct heat dissipation from the pumped end can sufficiently weaken the influence of thermal effect on the power output and this method is particularly suitable for solving the problem of heat dissipation in a high-power end-pumped solid-state laser.