Abstract：In so much as the reality that the baseline measurement will be gradually falling into disuse, precise range measurement instead of baseline measurement is practically studied and tested. By means of the analysis of measurement error, the combination with the related equipment performance and its technical requirement, and on the basis of the study for theory, precise range measurements had been conducted numerously indoor and outdoor. In the meantime, its technical design is constantly modified, and its operational regulation is revised as well. As a result, the baseline measurement technique is updated and digitally remodified. The results of 6 years monitoring show that the updated baseline measurement technique is successful, the achievement is worth to be widely applied.
