In long-cavity edge-emitting diode lasers, longitudinal spatial hole burning (LSHB), two-photon absorption(TPA) and free carrier absorption(FCA) are among the key factors affecting the linear increase in output power at high injection currents. In this paper, a simplified numerical analysis model is proposed for 1.06um wavelength long-cavity diode lasers by combining TPA and FCA losses with one-dimensional(1D) rate equations. The effects of LSHB, TPA and FCA on the output characteristics are systematically analyzed, and it is proposed that the front facet reflectivity and the position of the quantum well(QW) in the waveguide can be adjusted to improve the front facet output power.