During the last decades, the importance of small firms as one of the main economical parts in each country has been proved. Considering to the resources limitation in one hand, and the competitive global market in the other hand, it is very important that firms can obtain sustainable competitive advantages (SCAs) to compete with other rivals. This paper, at the first step, tries to explore the potentially SCAs of Qom & apos; s small firms by using of Structural Equation Model (SEM). Then, the real current situation of firms in using these competitive advantages has been examined. The results tell that except firms & apos; location, other potentially SCAs do not have acceptable condition.