Abstract: To investigate the impacts of the quadrature scheme and the number of quadrature points on the accuracy of full-spectrum k-distribution（FSK） method, the radiative source term in one-dimensional enclosure between two parallel plates filled with non-gray gases was calculated using FSK method combined with the discrete ordinates method in different cases. Numerical calculations were conducted using three types of Gauss quadrature schemes（Gauss-Chebyshev Even-rank quadrature scheme, Gauss-Chebyshev Odd-rank quadrature scheme, and Gauss-Legendre quadrature scheme） and the impacts of the quadrature scheme and the number of quadrature points on the accuracy of FSK method were investigated compared to the line-by-line calculations. Results show that there is a fluctuation for the accuracy of FSK method when the number of quadrature points increases rather than increasing all the time; the effect of the fluctuation can be decreased by increasing the number of quadrature points, and the acceptable accuracy can be obtained when the number of quadrature points is larger than or equal to 16 for different types of Gauss quadrature schemes.