The study aims to identify the reality of public spending and gross domestic product and analyze their trends during the study period. Then decide the relationship between them to identify the extent of the impact of public spending on gross domestic product in Iraq for the period 2004-2020. In order to verify the hypothesis of the study, a time series was used for the period (2004 -2020) and work on analyzing the variable of public spending and its impact on the variable of GDP during that period. Then measuring the relationship between the two aforementioned variables through the use of the autoregressive methodology for Automatically Distributed Deceleration (ARDL). The study concluded that there is a co-integration relationship between the variables of the study According to the Bound Test, it also found that the most influential variable in GDP is public spending. The most important recommendations made by the study are, working to increase investment spending rates and directing it towards the main sectors (agricultural sector, industrial sector). In order raise the level of economic activity, increase the growth rates of the gross domestic product, reduce unemployment levels, reduce inflation in the economy. And work to diversify the structure of exports and not rely on oil only, so that the work of fiscal and monetary policy is not affected by oil revenues.