ABSTRACT. In this paper, the properties of transformation matrices between the normal bases in orders of algebraic number fields of degree 3 are shown. Let K be a finite extension of the rational number field Q and let the Z K be integral closure of the ring Z in K -i.e. the ring of integral numbers of the field K.Ò Ø ÓÒ 1º Let K be an algebraic number field of degree n over the rational numbers Q. A Z-module B ⊂ K is called an order of the field K if B satisfies the following conditions:(2) B has a basis over Z consisting of n elements, (3) B is ring.Let K be a cyclic algebraic number field of degree n over Q. Such a field has a normal basis over Q, i.e. a basis which consists of all conjugations of one element.Transformation matrices between two normal bases of K over Q are exactly regular rational circulant matrices of degree n.In