The author puts forward a new view on the technology and application of the geochemical mercury survey which has been usedboth in China and abroad for years.This opinion points out the developing orientation of the mercury survey technology.It is held that mercury vapor comes mainly from structural faulted zones,that mercury anomalies are not necessarily in direct connection with various types of orebodies (except for mercury orebodies),and that mercury anomalies produced by orebodies are insignificant compared with mercury anomalies produced by barren structural faulted zones.It is also considered that mercury survey can be used in all geologic fieds related to structural faults.