Abstract: The influences of the adjacent holes spacing and blowing ratio on the adiabatic wall cooling effectiveness and convective heat transfer coefficient of effusion cooling with the film holes in staggered arrangement were numerically investigated.The results show that,with the decrease of adjacent holes spacing or the increase of blowing ratio,the average temperature in the film holes region reduces and the temperature distribution uniformity is improved for all the calculated cases,so that the adiabatic wall cooling effectiveness increases along with the convective heat transfer coefficient.In relation to the decrease of adiabatic holes spacing,the influence of blowing ratio increase is not obvious,especially when the blowing ratio is greater than 1,the influence becomes very weaker.