Abstract: Backup helium circulator for HTR-10 is supported by active magnet bearing (AMB). It is the first industry application in nuclear field in China. In order to verify the availability of helium circulator supported by AMB, a test facility was built in Shanghai. Some thermal test was conducted to simulate the working condition of the reactor. The experiment results show that system can work well under the high temperature conditions. Finally, helium circulator supported by AMB is succeeded in 100 h hot test.