An all fiber ring laser with a small segment of Er³⁺/Yb³⁺co-doped double-clad fiber as gain medium,pumped by a stable 976 nm high power laser diode,is experimentally demonstrated. Using mode-locked mechanism by nonlinear polarization rotation technique,adjusting the polarization controllers orientations and pump,the stable operations of passive Q-switched,Q-switched-mode-locked and continual mode-locked were obtained experimentally. The pulse repetition rate of Q-switched is from 7.583 kHz to 32.86 kHz and the pulse repetition rate of continual mode-locked is 8.843 MHz.We also observed ribbon spectrum and analyzed the result simply.