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The improvement of the torque converter performance necessitates an optimized design of the torque converter stator blade on the basis of a full understanding of the internal flow conditions. However, it is difficult to analyze the flow experimentally or theoretically because the three elements (a pump, a turbine, and a stator) rotate at different speeds and the flow circuit and the blade shapes are complex. Enough explication of the internal flow has not yet been made. This research has developed a new method of calculating the torque converter performance by taking the stator blade profile into consideration. The internal flow through the torque converter stator can be treated as a two-dimensional flow, and here the flow was analyzed as a potential flow. The analysis of the torque converter stator blade was made as follows.