The Helium Refrigeration System(HRS) supplies the Supercritical Helium(SHe) to the Korean Superconducting Tokamak Advanced Research(KSTAR) cold components such as the 16 toroidal field(TF) coils, TF structure, the 14 polodial field(PF) coils, and CS structure. All closed loop of the SHe path are arranged as two parallel circuits for TF and PF coils. For the plasma operation of KSTAR, the SHe mass flow is required more than 300 g/s for each circuit.