To study the improvement effect of cement content and curing time on the Guilin red-clay by analysis of direct shear tests and assays Macro function indoor quantitative test.It measured that the Guilin red-clay cohesion slows down after growth momentum by the same cement content.At the same curing period,internal friction angle increases with increasing cement content,while increasing cohesion is even more obvious,and the Liquid and plastic limits and boundaries of the moisture content increased.The reason is that incorporation with cement and conservation makes Guilin red-clay and cement harden-ing occurs.Then condensation nuclei form aggregates,mosaic,spatial structure cementation appear, showing high false flour,sand characteristics.%为了研究水泥掺量和养护时间对桂林红粘土的改良效果，通过直剪试验、液塑限联合测定法等室内定量试验进行分析。经试验测定，在相同水泥掺量时，桂林红粘土粘聚力增长呈先快后慢势态。在相同养护龄期时，内摩擦角随水泥掺量增加而增大，而粘聚力增大则更明显。液塑限和界限含水率提高。究其原因，掺入水泥并养护使得桂林红粘土与水泥发生凝结核硬化，构成团粒、镶嵌、胶结的空间结构，表现出较高的假粉、砂性特征。
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