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A superconducting energy recovery linac test facility (PKU-SETF) was built at Peking University,and a 2K cryogenic system,which is the first closed-loop 2 K cryogenic system for a superconducting accelerator in China,was constructed for the 1.3 GHz 3+1/2 cell dc-SRF injector.The main accelerator consists of two nine-cell TESLA-type superconducting cavities of the PKU-SETF.The commissioning and stable operation of this 2 K cryogenic system was carried out.A helium pressure stability of better than ±0.1 mbar and a total refrigeration capacity of 65 W at a temperature of 2 K was reached.