To study the flow characteristics of film cooling of flat plates with pulsation,the large eddy simulation (LES) calculation method was adopted to simulate inclined cylindrical hole transverse jet at nominal blowing ratio of 1.0 and the numerical techniques of high order symmetric weighted essentially non-oscillatory (WENO)- Roe scheme,implicit Newtonian time advance,dynamic Smagorinsky sub-grid model and the preconditioned technology were involved.The working conditions of inclined tube transverse jet included steady and pulsed jet.Calculation results showed the hairpin vortex structure in transverse jet flow field.Research shows that the pulsation of the jet hole import changes jet exit coherent structure,which means the mixing process of jet and mainstream is changed.