The Low Energy Accelerator Facility(LEAF)comprises a superconducting ion source,a LEBT,an RFQ,a MEBT and a test terminal.It comprises a lot of power electronics and consumes a large amount of electricity,which will eventually be converted into heat.The function of process circulating cooling water is to absorb and transfer the heat produced by these equipments,and realize the constant temperature regulating means of certain temperature sensitive parts,so as to ensure the long-term,reliable and stable operation of the LEAF equipment.The design requirement parameters are shown in Table 1.Primary water subsystem 1.