提出在卡计系数标定中采用直线拟合方法，综合考察相关系数、斜率、截距、斜率和截距标准偏差等参数，以斜率相对标准偏差作为采用何种直线拟合的主要判断依据；若过零直线拟合的斜率相对标准偏差小于不过零的斜率相对标准偏差，认为截距为随机误差，卡计系数标定按照非等精度的加权平均法求解；反之，应按照不过零直线拟合，截距为测试的系统误差，根据定位回归误差大小判断并剔除粗大误差；这样可以合理给出激光能量测试的卡计标定系数。

The calibration of energy calorimeter is one of the important aspects in the measurement of the energy of high power laser facility. Using the method of linearity fitting is suggested in the calibration of energy calorimeter. The standard deviation of slope is used as the main criterion for deciding which linearity fitting is adopted, and the correlation, the intercept, and the standard deviation of intercept are taken into account. If the slope standard error of zero crossing linear fitting is less than that of un-zero crossing linear fitting, then the intercept is considered as a random error. The calorimeter coefficient is solved according to the method of weighted average of un-equal precision. Otherwise, a great system error exists, the calorimeter coefficient is obtained by un-zero crossing linear fitting, and the value of intercept is a system error. According to the value of regression error, we can determine whether the gross error exists and how to eliminate it. In this way, the appropriate calorimeter coefficient is obtained. The analyzed results are of reference value for the exact measurement of laser energy.