Abstract: RER CONCEPTION AND IT， S APPLICATION INRIA QUALITY ASSESSMENTWu Defu(Beijing Nuclear Instrument Factory, 100020)ABSTRACTThe history, developing and applications in analysing of RIA random error are discussed. Some function expressions of RIA quality parameters are established. It supply the effective mathmatic methods for the theory analysis of RIA error and the normalized quality control.Key words reponse error relationship(RER) random error confidence limit quality assessment