The unstable noise temperature, a typical fault, has been detected existing in the Wuhan CINRAD since it was put into operation. The statistical analysis of symptoms, monitoring data and fault causes and the graded detection of the receiving channel module were performed, based on which the corresponding methods to solve the problems also devised. The detecting methods and techniques that should be mastered in CINRAD daily operating and technology supporting service are introduced to improve technicians’ capabilities of analyzing and solving problems.