The designed new type stitched sandwich structure of composite materials can avoid the disadvantages of fiber cross caused by the traditional angled stitch. The integrated stitched sandwich composite were prepared by VIMP (Vacuum Infusion Molding Process). The flatwise compression test and the three-point bending test were employed to study the effects of stitching structure, stitching mode and stitching yarn on compression properties and bending properties. Results show that the integrated stitched sandwich composites have excellent compression mechanical properties. Compared with the vertical structure, the flexure failure load is increased by 94.4%. Compared with the unpenetrate stitched mode, the compressive strength and the bending load of penetrating stitched mode are improved significantly. The compression properties and the flexure properties of stitched sandwich composite are improved with the increase of stitching yarn.