The purpose of this research is to present a new way to design and calculate the thermo hydraulic of stator blade of cooled Turbine to examine the effectiveness of cooling system. One of the methods of analyzing the cooling system of the blades is based on using Dynamic fluid calculation (CFD). Another way is hydraulic network in order to distribute the coolant airflow in the internal surface of the turbine blade. The advantage of this method is to reduce the time duration for calculation and its usage in complex geometric figures. Along with determination of the coolant air distribution we will be able to calculate the convection heat transfer coefficient in the internal surface of the blades. The calculation of the hydraulic network is based on graph theory. In this way first, the hydraulic network with coolant blade is created. Next, this network is simulated with an electrical network, and then the hydraulic network flow in the cooling canals systems along with computer codes is calculated by Kirishov rules and finally, in order to prove the validity of the given method, we can use a blade which the distribution of its cooling air into the input and output canals are seen and then the last result should be compared.