Abstract: The relationship between the damage and strain as well as the relationship between the maximum strain and fracture position were investigated by the quasi-static uniaxial tensile test of plain weave C/SiC composite using digital image correlation (DIC) technology analysis. The variation of material’s internal structure during the damage evolution has been explored by analyzing the material’s pore and fracture. The results show that the strain of the material under tensile load is not well-distributed. The damage difference between layers and their inter-action result in the constant variation of maximum strain position. With the accumulation of damage, fracture occurs first to the position of maximum strain and the fracture failure location of this material is often closely related to its structural weakness and the stress and strain level. At the moment of material fracture, the multiple pull-out mechanism and the structural difference in each of layers lead to different failure positions among layers, resulting in delamination failure.