Based on the theoretical model of ytterbium (Yb 3+)-doped fiber amplifier, the effect of the bend radius of Yb 3+ fiber on the mode transmission loss and dependence of optical-optical efficiency on the fiber length were analyzed. By employing the characteristics of the Yb 3+ fiber used in the experiment, the bend radius and fiber length were optimized. A master oscillation power amplification configuration was used. This configuration had a seed laser source with 170 W power, beam quality M2x=1.10, M2y=1.05, and a power amplifier with homemade 30/600 μm Yb 3+ fiber as the gain fiber. Dual-end pumping was adopted. We obtained a laser beam with an output power of 10.14 kW, a central wavelength of 1070.36 nm, and a 3 dB bandwidth of 5.32 nm. The beam quality of the output laser was M2x=3.12, M2y=3.18. In the amplification stage, the maximum optical-optical efficiency was 87.9%, and the slope efficiency reached up to 89.2%. The signal-to-noise ratio of the output laser was more than 45 dB.