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A soft X-ray pulse height analysis (PHA) system has been designed and installed on J-TEXT tokamak for the study of electron temperature and impurities.The system contains three Silicon Drift Detectors (SDD),a multi-channel analyzer (MCA),vacuum chamber,data collection procedure and off-line data processing program.A 60ms temporal resolution of electron temperature and the line radiation from moderate and high Z metallic impurities can be obtained by PHA system.Bascd on this SyStcm the performances of electron temperature and impurity have been investigated in J-TEXT ohmic heated plasmas.