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It is still a new technique to produce series of hydraulic radial piston pump using integrated CAD/CAM technique. That is, a hydraulic pump could be produced according to the required NC format program in NC machine tool (NC post-processing). The program is automatically generalized after the design stage in a RPCADM package is over. The one of the highlights to use the integrated CAD/CAM technique is how to use the similitude theory as basic principles for the series design in the CAD stage. Another is the method of transferring detail drawing into required G-codes based on the G-codes bank which NC machine tools could follow to produce the part. The theory and method are explicated in this paper. And the NC format program (G-codes file) conducted from CAD is shown. A package for CAD/CAM of hydraulic radial piston pump is introduced briefly.