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中文摘要：
通过玉溪遗址T0403探方11个古洪积层粒度参数分析,发现该遗址古洪积层的特征是：①遗址古洪积层粒度频率曲线为单峰正偏,分选差,概率累积曲线为典型三段式,且推移质组分〉40%;②洪积层角闪石、磷灰石等不稳定矿物含量高于现代洪水层,表明古洪积层主要为近源沉积。联系到古洪积层形成期（6.3~7.5 ka B.P.）属于全新世大暖期的高温波动期,干湿波动是造成玉溪地区洪水频发的主要原因,同时根据遗址文化地层出土的器物判断,古洪积层沉积粒度特征变化与新石器人类的农业生产活动有关。
英文摘要：
Based on the grain-size parameters of 11 paleo-flood layers in the trench of T0403 at the Yuxi Site of Chongqing,this article compared them with modern flood deposits and discerned the differences for the sake of sedimentary dynamics and provenance.The paleo-flood deposits were characterized by：（a）grain size frequency curves were single peak and positive skewness,and the sorting was poor.The cumulative probability lines appeared typical three-segmented patterns,and the bed-loading fractions exceeded 40%;（b） higher concentration of instable heavy minerals in the paleo-flood deposits indicated that the ancient alluvial components were near-sourced deposition;（c） the forming stage（6.3 ~ 7.5 ka B.P.） of paleo-flood deposits was in the Holocene climatic fluctuation period with frequent wet-dry changes with frequent floods;and（d） according to the unearthed artifacts and animal bones in the cultural sediments,human activities of primitive agriculture made an important impacts upon grain-size characteristics of paleo-flood layers in later phases of the Yuxi Site.Consequently,more and more anthropic disturbances had been involved in the big cycle of the nature with the advent of agricultural time.
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