Two micromechanics models of stitched lamina composites are established. Considering induced fiber bend angle gradient distribution and fiber bending region width by the suture, with T700/QY8911 stitched composite as an example, the elastic constants and the tensile strength of two kinds of models are calculated by using micromechanics method and numerical integral method. Calculation and experimental results show that the longitudinal elastic constant of the composite material is decreased due to the suture causing the fiber bending deformation. Whatever the maximum bending deformation value of the reinforcing fiber is, the smaller the width of the curved region of fiber is, the larger influence it will have on. It is concluded that the analysis of part fiber bending deformation causing by stitching is more correct than the whole area.