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an evaluation system for the precision of radar angular measuring based on the principle of optical imaging is proposed in this paper, which is composed by optical part (CCD camera), image sampling part and the image processing and target angle extracting part. With this system, the experimentation of calibrating fixed error and evaluating precision for radar angular measuring can be carried out with automation, high precision, and real-time processing. Theoretical analysis and simulation results show that the calibration and evaluation system based on machine vision has a precision of 0.005°for calibrating and evaluating radar angular measuring, under the condition that the usual experimental measurement error is achieved and the deviation caused by the difference of the position between radar system and machine vision system is compensated.