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A model is developed to calculate the emission spectrum of non-local thermodynamic equilibrium (LTE) plasmas.The collisional-radiative model is adopted for non-LTE population calculations. Configuration-averaged ratecoefficients that are needed in the rate equations are obtained based on the first-order perturbation theory. TheHartree-Fock-Slater self-consistent-field method is used to calculate electron wavefunctions. The present model isapplied to the calculation of isoelectronic line-ratio of Cr and Ti, which is useful for plasma electron temperaturediagnosis.