The solar directly pumped 1064 nm laser amplifier is designed, and the solar pumped laser amplification is realized. The laser amplifier uses Fresnel lens and metal conical cavity as sunlight gathering system. The laser materials are Nd∶YAG and Nd/Cr∶YAG disk. The theory of solid-state laser amplification is analyzed. The sunlight gathering system is simulated by tracePro, and the pump power density at surface of the laser material is calculated. Based on the physical properties and optical features of Nd∶YAG and Nd/Cr∶YAG, the internal temperature distribution of the laser material is simulated with LASCAD to verify the feasibility of the design. When the solar radiation power density is 900 W/m2 and the maximum seed laser power is 300 mW, the maximum laser output power is 475.1 mW. Experimental data of different sunlight gathering systems and laser materials are analyzed comparatively to provide direction for further improvement.