Abstract: A general Textile geometry modelis presented for the elastic analysis of textile structural composites.The geometrical characteristics of the yarns in the unit cells are considered and based on fiber undulation and continuity in three dimensional space,actual cross sectional geometry of the yarn and the influence of mutual tangle between yarn,the model is established.A unified analytical method and software is obtained by using the model.The theoretical predicted values are compared with the experiments for 3D braid structural composites.The result are fairly good for selected test specimens.