Abstract: In order to enhance the heat transfer capability of a lattice array structure and to improve the design of the cooling structures for the main flow hypersonic film cooling, this paper analyzes the thermal protective performance of the system, when the main flow hypersonic film cooling involves lattice array structures. The interactional mechanism between the main flow hypersonic film cooling and the Kagome, the BCC and the Pin-fin array structures is studied by the 3D numerical calculation. It is shown that the kidney vortices fit better with the wall in the lateral direction due to the disturbed flow caused by the array structures; the efficiency of the lateral cooling on the downstream of the film hole is improved, indicating a strengthened coverage effect of the hypersonic film cooling.