<p>Owing to the continuous temperature variations in nuclear reactor operations, on-the-fly Doppler broadening methods are widely adopted in neutron transport simulations to generate nuclear cross-sections for various temperatures. In current approaches, the widely used SIGMA1 method is inefficient because it involves complementary error and Taylor series expansions. In this paper, we present a new on-the-fly Doppler broadening method based on non-zero-temperature cross-sections. In this method, the improved Gauss–Hermite quadrature and free gas model are adopted to broaden the cross-sections at low-energy range. Meanwhile, the Gauss–Hermite quadrature of different orders is adopted to broaden the cross-sections at the resolved resonance energy range. The paper presents a detailed introduction to the typical nuclide cross-sections and designed tests with the NPTS program. Results demonstrate that this method efficiently generates temperature-dependent neutron cross-sections while maintaining target accuracy.</p>