The HLS-II storage ring is 66.13 m long in circumference and operated with an energy of 800 MeV. It is comprised of 8 bending magnets, 32 quadrupole magnets and 32 multi-function sextupole magnets. The storage ring has 8 straight sections. One straight section is used for the injection system, by which the electron beam can be injected into the storage ring from the linac injector. One section is used for the installation of the RF cavity which supplement the energy loss of the electron beam due to synchrotron radiation. The other 6 straight sections are used to install different kinds of insertion devices (IDs) according to the requirements of the light source users. The straight sections occupies 38% of the entire storage ring, which reaches the world-class levels. Main parameters of the HLS-II storage ring Circumference66.13 mBeam energy0.8 GeVRF frequency204 MHzHarmonic number45Energy loss (/electron/turn)16.73 keVNatural emittance<40Beam current300 mANatural energy spread (rms)0.00047Beam lifetime>5 hrsNatural bunch length14.8 mm(about 50 ps)