Aiming at the necessity to obtain the relationship between the output value of the pressure sensor and the loaded standard pressure value according to the metrological verification data when a pressure sensor is used in engineering measurement, the characteristic relationship between the output voltage of the pressure sensor and the standard pressure is analyzed by using the methods of normal test and variance analysis. According to the calculation results of correlation coefficient, a univariate linear regression model is established. The goodness of fit, linear relationship, regression coefficient and residual error of the univariate linear regression model are analyzed. The results show that the univariate linear regression analysis method can be applied to the fitting analysis of pressure sensor verification data in metrological verification, which has important reference value for metrological verification personnel to study other similar verification data fitting methods.