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The GUM method has always been used to evaluate the uncertainty of the thrust measurement of the engine test. There are problems such as the assumption of the probability distribution of the input and output and the approximation of the nonlinear model, which have certain limitations. Taking engine thrust vector measurement as an example, the article briefly describes the mathematical model of piezoelectric thrust vector measurement, uses GUM method to evaluate the uncertainty of thrust vector parameters, and analyzes the principle, specific evaluation process and application of Monte Carlo method. The software was compiled and the uncertainty evaluation result was compared with the GUM method evaluation result. The comparison results show that the Monte Carlo method is more suitable than the GUM method in the process of evaluating the uncertainty of the thrust vector parameters of the engine test.