Metallic metal tanks are of vital importance because of the ability to hold water or any other liquid. Air reservoirs are classified as special structures due to their special geometry including high altitude and heavy metal adherence above the base. These structures are generally horizontal in the direction of flexibility. Due to the destruction of some of these structures under recent earthquakes, there is a strong need for the vital resources of water after the earthquake. The necessity of investigating the behavior of reservoirs during the earthquake and ways of coping with them is very important. Air tanks are among the most important structures during and after the earthquake this reason, the seismic behavior of air reservoirs has attracted the attention of many researchers. But in seismic analysis, reservoirs always affect the behavior of the fluid and the structure. For this reason, the effect of fluid and structure interaction on the seismicity of reservoirs is an important and important issue. Which is presented in the present paper for metallic metal reservoirs by changing the height of the base of the reservoir using a finite element method.