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A new type of film cooling hole with micro groove structure is presented in this paper.Based on the finite volume method and the Realizable k-ε model,the film cooling process of the hole in a flat plate structure is simulated.The surface temperature distribution and film cooling effect of different film cooling holes were analyzed.The effects of micro-groove structure on wall attachment and cooling efficiency of jet were discussed.The results show that under the same conditions,the transverse coverage width and overall protective area of the new micro-groove holes are larger than those of the ordinary cylindrical holes and special-shaped holes.Compared with ordinary holes,the new micro-groove holes can better form the film covering on the surface and enhance the overall film cooling efficiency of the wall.For example,when the blowing ratio M=1.5,the effective coverage ratio of micro-groove holes is 1.5 times the dustpan holes and is 8 times the traditional cylindrical holes.It provides reference data and experience rules for the optimization and selection of advanced cooling structure of high performance aero-gas engine hot-end components.