The architecture and preserved sedimentary structures of alluvium have been shown to correlate to variations in river discharge patterns and reflect the paleoclimatic conditions of the time of deposition. The co-efficient of variance of annual peak discharge (CVQp = standard deviation of the annual peak flood discharge over the mean annual peak flood discharge) has been used as a basis for a new set of fluvial facies models independent of river planform. Deposits of rivers with low CVQp are internally dominated by dune-scale cross-bedding and preserve macroform architecture in full with limited lateral and vertical lithological variability, whereas increasing values of CVQp are associated with increasing abundance of flow transcritical structures, poor preservation of macroform architecture, increasing lithological variability, and increasing evidence of high magnitude/low frequency flow events that are often high-concentration flows. This paper investigates the lithofacies and sedimentary structures of the Liujiagou Formation in the Shuiyuguan Section of Shanxi Province. Additionally, it examines the fluvial styles represented by the fluvial architectural elements. Paleocurrent measurements indicate that Liujiagou Formation channels consistently flowed from NNW to SSE. Vertically, the lower part of this formation was dominated by cross-bedding, indicating deposits of moderate CVQp rivers. The middle part was characterized by cross-bedding and flat/low-angle-stratification, reflecting an alternation of moderate-to-high CVQp river deposits. The upper part is almost entirely composed of high-flow structures, signifying deposits of high CVQp rivers. High CVQp rivers dominated the Early Triassic Liujiagou Formation. This pattern indicates that the climate in the Early Triassic became increasingly arid, with intensified seasonal flash floods. The evolution of the CVQp of fluvial deposits from moderate to high was coupled with the transition from semi-arid climate to seasonally arid climate from the Permian-Triassic transition to the Early Triassic. This evolutionary model reveals the important control of paleoclimates on fluvial sequences, and it uses a recently-published model to provide insights into some fluvial deposits and their formative paleoclimatic controls.