This survey has aimed at knowledge how the effect of inflation average is on the volume of the Islamic deposit banks. This survey has been made on a group of Islamic banks in Syria during the period from 2006 to 2014. The descriptive analytical method has been followed in this survey, and analyzing data by using the program Statistical Package for the Social Sciences spss. And this survey has concluded that there is a positive relation between inflation average and the volume of deposits, in addition the increase of deposit volumes in Islamic banks during the survey period except for the year 2011 which saw a decrease in the deposits average, and also an increase in inflation average in general until the year2011. However, the increases have become sudden and so big.