The purpose of this paper is to construct an orthogonal Armlet multi-wavelets with multiplicity r and dilation factor a. Firstly, the definition of Armlets with dilation factor a is proposed in this paper. Based on the Two-scale Similar Transform (TST), the notion of the Para-unitary A-scale Similar Transform (PAST) is introduced, and we also give the transform on the all two-scale matrix symbols of the multi-wavelets with dilation a. Then we show that the PAST and the transform on the matrix symbols of the multi-wavelets keep the orthogonality of the multi-wavelets system. We discuss the condition ndition that a − 1 multi-wavelets corresponding to the multi-scaling functions are all Armlets. After performing the PAST and the transform on the matrix symbols of the multi-wavelets, the multi-scaling function can be balanced and the corresponding multi-wavelets can be Armlets at the same time. The construction of Armlets with high order is also discussed. At last, by a given example, we can conclude that the algorithm is feasible and efficient.