[en] A full scale hot testing facility is built up to test the main equipment of the fuel circulating system and control system of the 10 MW high temperature gas cooled reactor (HTR-10) in real operating temperature and helium of the reactor and to gain designing and operating experience. OMRON C200H PLC and a mosaic simulation pane are used in the control system. The operation status of the system is controlled and monitored by the computer. All the designing and operating experience have been applied to the construction design of HTR-10