The properties of Er3+∶Yb3+ co-doped phosphate glass waveguide pumped by LD are systematically investigated and the rate equations of its quasi-three-energy-level system set up and solved under the steady state.The characteristics of the output power of 980nm laser diode in pumping are analyzed by numerical simulation.The results show that Er3+∶Yb3+ co-doped phosphate waveguide lasers with high fairly high output power and slope efficiency and relatively low threshold power can be achieved on optimized analyses.