Comparative spectral profiles pre- and post-resolution reduction for a stellar model with T_eff = 3500 K, log g = +4.0, and [α/Fe]= + 3.0. The grey curve depicts the original high-resolution spectrum. The red curve illustrates the spectrum after Gaussian convolution processing, which reduces the resolution to simulate the observational effect of the CSST. The wavelength range extends from 2550 to 10 000 Å, displaying the changes from the UV to the NIR region following the resolution-degradation process.