Abstract: A systematic description of the procedure and method of calculation used in designing the single stage centripetal hydraulic torque converter is given in the paper, taking WP-525 and WP₄-690 Hydraulic Torque Converters as samples. In the choice of parameters for calculation, such important parameters as 6^* and μ_B affecting the performance of the converter are given more detailed analyses. It is pointed out that for the single stage centripetal hydraulic torque converter, when the turbine and pump are aymrnetrically arranged, a greater value of μ_B should be used, and calculation based on existing empirical formula seems to be unreasonable. Through theoretical analysis and experiment, it has been verified that the change of value λ_B of the torque of the pump may be effected by changing the outlet angle of the stator. When the other parameters are constant, an increase of the outlet angle from 150° to 155° may reduce the value λ_B of the torque of the pump by 13%.