Sandwich composites are becoming more acceptable as primary components in the structure of helicopter. The design of laminate zone is extremely important, not only need to meet the requirements of the design of part assemble and aerodynamic shape, but also to achieve the goal of the light weight design as possible. An investigation with experiment and analysis on typical laminate test article of SynCore film has been accomplished. The results show that the experiment data of HC 9823.1 K20 aero laminate is steady and reliable, take the extrusion strength of 44.8MPa could be the reference of the helicopter structure design and check analysis of sandwich composites.