A new-style single mode output tunable erbium-doped fiber ring laser employing advanced two-stage integrated acousto-optic tunable filter (IAOTF) is presented. It has simple structure and can be tuned conveniently, widely and rapidly by changing the acoustic frequency. Considering the conversion efficiency of this IAOTF and neglecting amplified spontaneous emission (ASE) and excited-state absorption (ESA), the characteristics of the laser such as line width, output power, slope efficiency, and threshold power are discussed. When pumping power is 100 mW and radio frequency (RF) is 175 MHz, the center wavelength of the laser is 1550 nm, output power peak is about 6.34 mW, slope efficiency is 7.19%, and output peak with a full width at half maximum (FWMH) of 0.1 nm is obtained, the tuned peak gap is about 0.88 nm when changed the acoustic frequency by 0.1 MHz. Because the tunable range of the IAOTF is wide (about 180 nm when acoustic frequency changes in 20 MHz), the tunable range of the laser is only decided by the gain bandwidth of the erbium-doped fiber.