The multi-axis consistence detecting device is used for measuring the consistence of each axis in self-propelled antiaircraft gun in the out-field. For testing the measurement accuracy of the testing device, the research on testing technology of multi-axis consistency is conducted, and the testing technology of double warp and woof with multi-spectrum parallel optical tube has been demonstrated, which realizes the accurate measurement of the consistency of multi-spectrum and large spacing of optical axes in the outfield. And the error analysis indicates that the accuracy this method is better than 2″, offering a new scientific and practical method to quantify testing technology of multi-axis consistency. In order to accurately assess the technical performance of the multi-axis consistence detecting device, in line with the tactical technical requirements of self-propelled anti-aircraft guns, a new idea on evaluating performance of detecting device based on axis-vector is put forward, solving the difficult problem that the axis angle cannot scientifically assessed by the measurement accuracy of the detecting device. Moreover, the detection technology of the axial vector and the assessment method of the measurement accuracy are thoroughly studied, and the uncertainty of the assessment method is analyzed, which provides a basis for scientifically assessing the technical performance of the multi-axis line consistency detection device.