The objective of the study: To diagnose the reality of the relationship between the fluctuations in world oil prices and their reflection on the trends of government spending on the various economic sectors.

The research found: that public expenditures contribute to the increase of national consumption through the purchase of consumer goods by the state for the performance of the state's duties or the payment of wages to employees in the public sector and thus have a direct impact on national consumption

The results of the standard tests showed that there is no common integration between the oil price fluctuations and the government expenditure on the security sector through the ARDL test. The table value of the minimum parameter (3.62) was 5%, which is higher than the calculated value of 1.055303 ) Because of the security conditions experienced by Iraq after 2003, which necessitated spending on security significantly even with low oil prices, also through the ARDL test, which was conducted to ensure the existence of a common integration between the expenditure on the health sector and fluctuations in oil prices for the period (2006_2016) The value of

 f calculated (1.501817) at a significant level of 5% and is smaller than the Tabulated value to the minimum the same parameter, which amounted to 4.16, indicating that there was no relationship or mutual influence of the independent variable on the dependent variable and vice versa.

The research recommended Iraq should diversify its economy and not just oil as a single factor in maximizing public revenues, and this should not be considered when oil prices are low, but to think and find serious solutions to this issue and establish sovereign funds to benefit from the abundance of revenues in the event of high oil prices. To counter future oil price declines.