Service de Physique Theorique de Saclay,

We show that the action of universal R-matrix of affine U q sl 2 quantum algebra, when q is a root of unity, can be renormalized by some scalar factor to give a well defined nonsingular expression, satisfying Yang-Baxter equation. It reduced to intertwining operators of all representations , corresponding to Chiral Potts, if the parameters of these representations lie on well known algebraic curve. We also show that affine U q sl 2 for q is a root of unity form the autoquasitriangular Hopf algebra in the sence of Reshetikhin.