An all-normal dispersion tunable mode-locked fiber laser with a nonlinear amplifying loop mirror is experimentally investigated. The laser employs an all-polarization-maintaining figure-8 cavity consisted of main loop and nonlinear amplifying loop mirror. At 1030 nm, the stable mode-locked laser is initiated by adjusting two loops′ pump power, which delivers pulse width of 17.61 ps, repetition frequency of 4.133 MHz, and average power of 2.151 mW. A tunable filter is employed in the cavity to select the laser wavelength as well as force the laser operating in all-normal dispersion dissipative regime. The wavelength tuning range is 1015-1080 nm while the pulse duration ranges from 7.86 ps to 17.80 ps.