These datasets accompany the western Xiaojiang fault surface coordinates that were used for construction of the fault geometry model, the extrapolated velocity model from Shen et al. (2015), and the observational fault surface slip of the 1833 Songming M 8.0 earthquake in Dynamic rupture simulation of the 1833 Songming, Yunnan, China, M 8.0 earthquake: Effects from stepover location and overlap distance submitted to Earth and Space Science by Yu et al. (2021). The data is structured as follows: Once unzipped the data within the archive are three folders structured as follows: subfolder "extrapolated velocity model" is for the extrapolated velocity model, "fault_coordinates" is for the western Xiaojiang fault surface coordinates and "fault_slip" is for the observational fault surface slip. Inside the first folder, there is one NetCDF file, volume_media.nc. The variable x, y, depth starts from 0 km, 0 km, and 4 km, and ends at 200.70 km, 333.96 km, and -40.52 km; x = 0, y = 0 corresponding to 102°, 24°; x = 200.70, y = 333.96 corresponding to 104°, 26.5°. Inside the second folder, there are three txt files, "wxj_conti.txt" is for the continuous western Xiaojiang fault model, "wxj_qshso.txt" is for the western Xiaojiang fault model with Qingshuihai stepover structure, and "wxj_yzhso.tx" is for the western Xiaojiang fault model with Qingshuihai and Yangzonghai stepover structures. Inside the third folder, there is one txt file, 'fault_surface_slip.txt' is for the observational fault surface slip of the 1833 Songming earthquake with the coordinates.