Background: Accurate and quantitative measurement of plasma radiation is a key issue to Tokamak

toroidal magnetic confinement device.The radiations from Tokamak cover large energy range.Driven by the determination of the obtaining of hard X-ray spectra

a new system based on a high performance CdTe detector was built up in EAST Tokamak

the first non-circle cross-section in the world.Purpose: Introduces the device of hard X-ray diagnosis system in the EAST Tokamak on the Port A.The system can measure the plasma hard X-ray（20–200 keV） spectra under different discharge conditions

including Ohmical shot and Lower Hybrid Current Drive（LHCD） shot.The research of high speed electron which produced by LHCD is also the aim of the new system.Methods: A high performance CdTe detector was using in EAST Tokamak to measure the hard X-ray（20–200 keV） spectra.Results: The results show that the new system based on a high performance CdTe can meet the requirements for measuring the EAST Tokamk.Conclusions: A preliminary experimental result showed that the system can meet the requirements for measuring the X-ray bremsstrahlung of plasma in the energy range from 20 to 200 keV.Calibration result and typical measurement result on EAST are present in this paper.