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The output amplitude flatness of signal generators is an important technical index to evaluate the output property of a signal generator. In this paper, the measurement method of output amplitude flatness is introduced, and measurement mathematical models are proposed according to different formulas. Because of the nonlinearity of the mathematical models and the possible interdependency between different input variables, it must be considered whether the higher-order items and the covariance items in the Taylor series expansion should be taken into account in the combined standard uncertainty in the process of the measurement uncertainty analysis. It is analyzed whether the higher-order items could be ignored according to their contributions to the combined standard uncertainty. And the expanded uncertainties are compared when the correlation coefficient is evaluated at different values-‘0’, ‘1’ and the experimentally decided value, respectively. In the end, a valid method is proposed to avoid working on the covariance items in the measurement of the output amplitude flatness,and some practical suggestions are offered on how to deal with the problems that are the influences of environment temperature and power supply and impedance matching on the measurement uncertainty of the output amplitude flatness of signal generator.