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For the Circuit characteristics of a radar timer board, this paper presents a circuit board-level fault diagnosis test method based on simulation. Firstly, usied pspice to perform functional model modeling and fault model modeling on the circuit under test, constructed a circuit simulation schematic diagram based on the functional model for functional simulation,and then used the fault model for fault injection to perform fault simulation,After the simulation, obtained the function simulation and fault simulation data,extracted the characteristics of the simulation data by wavelet analysis,including energy distribution feature extraction, extremum feature extraction and entropy feature extraction, and did the test point optimization to delete the redundant data, finally trained the feature data through the concept lattice method to generate a fault diagnosis model applied to the measured object. Used the fault diagnosis model to perform fault reasoning on the diagnostic data, which verified the feasibility of the test method.