Abstract: The match of prime motors with hydraulic torque converters is one of
the more important problems in drive system design for workover rigs.
whether thematch is correct or not directly decides the workiag per-formance and economic property of workover rigs.The . match calculation by the diagramatie method is more complex, Especially, it is most diffi-cult to select an optimum match among so many torque converters for a prirae motor.Therefore,the problem of optimum. match among all torque converters being able to be selected for a known motor is discussed in this paper.Basic assessment parameters.for match nature are analysed，a weighted synthetic assessment index is presented，and the computer prog-ram for the optimum match design is compiled.The program is written in Basic Language，and is very simple and useful .An example is calculated in this paper.