概述了三维四步 (1× 1 )编织复合材料几何模型的研究进展 ,分析了三维四步正规编织过程中纤维束的运动路径及交织方式 ,提出了一种三维实体单元胞体几何模型 ,研究了三维编织复合材料单元胞体的几何性 ,并讨论了纤维束的挤压条件 .和传统的几何模型比较 ,该模型体现了纤维束的连续性 ,使得各单元胞体之间合理地组装 ,保证了复合材料整体结构的完整性 In this paper, the research progress of geometric model of three-dimensional four-step (1 × 1) braided composites is summarized. The movement path and interweaving mode of fiber bundles in three-dimensional four-step regular braiding process are analyzed. A three-dimensional solid cell geometric model is proposed. The geometry of the cell body of the three-dimensional braided composites and the extrusion conditions of the fiber bundles are discussed.Compared with the traditional geometric model, the model shows the continuity of the fiber bundles so that the cell bodies in each cell are properly assembled to ensure the composite The overall structural integrity of the material