SiC fiber fabric is an important toughening material for high temperature resistant ceramic matrix composites. In this paper, plain weave SiC fiber fabrics were taken as the research object. The uniaxial tensile test and ±45° off-axis tensile test were carried out to obtain tensile and shear properties. Yarn extraction test was performed to obtain the friction coefficient between the warp direction and weft direction yarns. X-ray computed tomography (CT) scan was carried out to obtain miscrostructure, and the cross-section and crimp shape of the warp direction and weft direction yarns were fitted by the least squares method. The simply beam model of the yarn was established to calculate the friction moment of the yarn under shearing process, and the shear stress-strain curve of plain weave SiC fiber fabrics can be predicted. The shearing process of plain weave SiC fiber fabrics is divided into two stages, the pure shearing stage and the yarn extrusion stage, and the junction point of the two stages can be defined as the locking angle of plain weave SiC fiber fabrics. The results have reference value for the subsequent design and preparation of plain weave SiC fiber fabric preforms.