To provide a conveying motion preparing method capable of reducing the preparation man-hour of the conveying motion when constructing a replica press line using the same die as that of an existing press line.

The conveying motion preparing method includes: a data reading step (S1); a new lower die interface curve initially setting step (S105) of initially setting a temporary lower die interference curve at the position sufficiently separate above from an existing press line lower die interference curve by using the data on the existing press line lower die interference curve and the data on the conveying condition; and a conveying path setting step (S106) of generating a new lower die interference curve by providing a plurality of control points on the temporary lower die interference curve at a predetermined spacing, and moving the plurality of control points respectively toward the existing press line lower die interference curve so that the plurality of control points have the predetermined minimum clearance from the existing press line lower die interference curve.