The orthodontic treatment has become simple since the straight arch wire technique was introduced. From then onwards, various improvements have been made on this new method. One of them was to make a bracket small in size. The result was that the effect of wire become more excellent because of the distance between two brackets being changed longer by this small bracket and the disgraceful feeling of patients with bracket was reduced by this one. We call this one mini-bracket. This author has applied it clinically and has gotten good results. And so, the author summarizes the orthodontic points of two case reports of orthodontic treatment using the straight arch wire technique with mini-bracket.