Measurements of heat transfer and pressure drop in the short pin fin array used in trail cooling channel of turbine blade have been performed.Effects of diameter and shape of pin on heat transfer and pressure drop were investigated.The results show that:(1) The pressure drop increases with the increase of diameter and the pressure drop of round pin fin array is greater than that of cone pin fin array.(2) The heat transfer on the endwall of round pin fin array channel is stronger as compared with that of cone pin fin array channel.(3) As diameter increases

the increase of pressure drop is faster than that of heat transfer and the ratio of heat transfer to pressure drop of cone pin fin array is larger than that of round pin fin array.