Numerical method was used to analyze the characteristics of heat transfer and flow resistance in micro channels in the middle of turbine blades;and the effect of aspect ratio and the rib aspect ratio in the micro channels was also studied.The result shows: in the case of the inlet Re=11000

if the rib aspect ratio is invariable

and the aspect ratio of micro channel increases

the integrated effect of heat transfer will increase firstly and then decrease;if the aspect ratio is invariable

and the rib aspect ratio increases

the integrated effect of heat transfer also will increase firstly and then decrease.