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The paper do a research on the problem that the automatic test system has a large test deviation in measuring a type of combined receiver， combining the small signal analog measurement of the combined receiver , verifying the factors that may cause the “out-of-tolerance of small signal analog test” in automatic test system with quantitative experiment and engineering experience, it is found that the measurement deviation of combined receiver’s audio output power is mainly caused by system error, course channel circuit and down channel circuit are mainly caused by power harmonics. Based on this Conclusion, a solution to correct the measurement error is purposed, which is using integrated power filter and software filter in automatics test system. Adopting the method in a certain type of combined receiver’s reinspection, it’s shows that the test results are close to appearance data, also which is a feasibility method verified by an outfield support.