This study aimed at revealing the reciprocal role of the domestic investment in Jordan in affecting and being affected by some economic variables. The researcher used the appropriate statistical analysis by using (ols) way and the (e-views) program. The study concluded a group of results, the most important of which is that the domestic investment affects and is affected by the gross domestic product as being one of its components. The domestic investment also did not have a positive role in the increase of the magnitude of national exports. The study concluded a group of recommendations, the most important of which is the increase of concern about domestic investment and the increase of incentives to productive sector as they are important in reducing the problems of both poverty and unemployment.