Core orientation technology is an engineering method, by which original ore bed occurrence can be directly and accurately obtained. Reflex ACT series core orientation device produced by Reflex Company of Australia are introduced in this paper about its structures, technical parameters, operation process of core orientation technology. Good results had been achieved since Reflex ACT series core orientation device was applied in Tanjianshan gold mine of Qinghai Province, the experience and the understanding in the advice application are summarized.