Key technologies for remote detection of csns radiation environment *

China Spallation Neutron Source (CSNS) has been continuously running since September 2018. As the running time increases the radiation dose will also increases, and some equipment maintenance and testing must use special tools due to the high radiation dose. This paper mainly introduces several detection technologies which had been used in the CSNS radiation environment, such as remotecontrolled vehicle using in front of the target station, strong magnetic field environment vibration measuring system, quick response (QR) code tracing patrol vehicle and remote image measurement system, etc. These technologies also have a guiding significance to other related fields.