Using a novel, all-fiber structure composed of WDM, fiber grating and home-made Yb 3+ -doped single-mode fiber, the F-P cavity laser operating at 1060 nm with narrow-FWHM is realized. Optimal length to be 9 m are found through the experiment for different length of the YDF. The threshold of launched pump power is 30 mW. When launched pump power is 42.8 mW, the maximum laser output is 8.8 mW with a FWHM<0.5 nm. The slope efficiency is 70.4% with respect to the launched pump power.