The interest rate is one of the most important way by the monetary police for achieving its economical goal and raising growth rate, it effects on banking activity by accepting deposits and giving loans, which mean that harmonic between the structure of banking deposits and loans give a needed support to investment, production and income to reach the stability economic. To show the relationship between interest and growth rates, we have to aware the various effectives of inflation and population rates on real growth, so we study it by using statistical system SPSS.