Abstract: Based on midchord region model of tubine blade whose impinging tube is supported by pin-fin arrays,the heat transfer rules of the wall with pin-fin was acquired,and then the heat transfer characteristic was compared with that of the model whose tube is supported by rib along the flow direction.Various impinging Reynolds numbers,density flow ratios of initial cross flow to impinging jet flow and impinging distance to impinging jet hole diameter were analyzed.The results show that: pin-fin arrays could decrease the negative influence of the initial cross flow on the heat transfer and the initial cross flow could strengthen the efficiency of heat transfer of the region after the cross flow.The heat transfer efficiency of the model with pin-fin arrays is higher than the model with rib along the flow direction.