Abstract: The Iranian Light Source Facility (ILSF) is a 3 GeV third generation synchrotron light source facility. The storage ring is based on five-Bend Achromat lattice providing an ultra low horizontal beam emittance of 0.48 nm rad. In this talk, I present the design feature of the ILSF storage ring, give the linear and nonlinear dynamic properties of the lattice and discuss the related beam dynamic specifications.