The development history of Er/Yb codoped phosphate waveguide laser is introduced. The energy level configuration, laser mechanism and influence factors of Er3+ and Yb3+ are presented, as well as phosphate glass's characteristics. Recent research progress, fabrication method, physical configuration and operating performance of Er/Yb codoped phosphate waveguide laser array are illustrated in detail, in addition to the waveguide laser array's superiorities to the Distributed Feedback (DFB) semiconductor laser in optical fiber communication. The application value of the waveguide laser array in the future wavelength division multiplexing (WDM) system is indicated.