Background:Experimental Physics and Industrial Control System(EPICS) is the distributed control system software which is commonly used in large-scale experimental physics facilities.Purpose:We wish to apply it into the field of molten salt reactor relevant process control

e.g.HTS 1sttest loop of thorium-based molten salt reactor(TMSR)

which is characterized by heating

circulation

cooling and other process control.Methods:During the development of EPICS based control system

the Simense S7-300 PLC and Yokogawa FA-M3 PLC hardware drivers specification format transformation has been done

to support the Autosave and devIocState plug

and ASYN serial communication between the DTI-1000 reference digital temperature indicator and the EPICS IOC has been developed with the StreamDevice packages

also EDM interface program was modified to support PV control of the "molten salt flow"

"fans"

"molten salt pump rotation"

etc.by dynamic symbols.Results:EPICS based control system achieved the standardized communication of three hardwares with different types

the monitoring and storage of nearly 500 process variables

and the dynamic monitoring of control process.Conclusions:The EPICS-based control system can achieve the molten salt heating

feeding

cooling and other process control of the molten salt test loop.Safety analysis and research of control system requires further efforts to implement.