The concept of deficit in public budget becomes a chronic economic phenomenon in most of the world, whether the advanced countries or developing countries. Despite  the difference in the visions of the economic schools to accept or reject the deficit in public budget but the opinion that prevailed is the necessity of the state to reduce the public spending which led to a continuous deficits in the public budget which consequently increased the government borrowing ,increase income taxes and wealth, consequently this weakened the in motivation in private investment which contributed to the increase of in factionary stagnation , so that governments have to cover the lack of local funding sources which become difficult to be equal to increase and continue in public spending ,hauling problem funding from the main problems faced by state developing especially lraq ,what forced to the direction to the loans external which are often conditioned conditions by political and economic complicated ,hence it has focused find the estimation and analysis of relationship between the deficit in budget public and external debt by duration (1990-2016) as a result of the difficult circumstances experienced by lraq during the period  ,the balance was the balance has been exhausted highest level of the study of disability as a result of the continuous increase in public spending ,which resulted in an increase in external debt as a source of funding this deficit ,and in the framework of rating this relationship has reached researcher to the presence of relationship equilibrium long –term between the deficit in budget public and external debt.