A DP curve is a new kind of parametric curve defined by Delgado and Pe

&

#xF1;a (

2003

2003

); it has very good properties when used in both geometry and algebra

i.e.

it is shape preserving and has a linear time complexity for evaluation. It overcomes the disadvantage of some generalized Ball curves that are fast for evaluation but cannot preserve shape

and the disadvantage of the B

&

eacute;zier curve that is shape preserving but slow for evaluation. It also has potential applications in computer-aided design and manufacturing (CAD/CAM) systems. As conic section is often used in shape design

this paper deduces the necessary and sufficient conditions for rational cubic or quartic DP representation of conics to expand the application area of DP curves. The main idea is based on the transformation relationship between low degree DP basis and Bernstein basis

and the representation theory of conics in rational low degree B

&

eacute;zier form. The results can identify whether a rational low degree DP curve is a conic section and also express a given conic section in rational low degree DP form

i.e.

give positions of the control points and values of the weights of rational cubic or quartic DP conics. Finally

several numerical examples are presented to validate the effectiveness of the method.