Red sandstone is widely distributed in the Jingbian region in the southwestern areas of Yulin. The sandstone is predominantly wavy and contains significant sedimentary bedding. It is important to investigate the sedimentary genesis and dynamic changes associated with Jingbian red sandstone and discuss the paleoclimatic characteristics of the sedimentary period of this sandstone formation. In addition, this research has important implications for advancing our understanding of the sedimentary environment of red beds in northwestern China. For stratified sampling, four sections with thick and thin interbeddings were selected, and 120 samples of red sandstone samples were obtained. Based on grain size composition, grain size parameters, end-members, and magnetic susceptibility, the following conclusions were drawn: \mathrm{①} The proportion of medium sand in the sandstone was 51.24%, followed by coarse sand, fine sand, and silt. The grain size of the thick sandstone was larger than that of the thin sandstone. \mathrm{②} Sandstone in the study area did not constitute aeolian sediment; it belonged to freshwater river lake facies, and the four separated end-members (EM1~EM4) indicated an overall strong transporting force. \mathrm{③} During the sedimentary period of the sandstone, the climate alternated between dry and wet conditions, and there was no typical arid climate. The fine grains of the thin layers and high magnetic susceptibility in these sections were indicative of a relatively humid climate, and precipitation during the sedimentary period of the thin-layer sandstone was higher than that of thick-layer sandstone.