This is a report of the research about the Chinese mainland vertical motion with the help of the methods employed,results obtained in recent fifty years, using the materials of the national high precision leveling in three periods since the establishment of the People s Republic of China.

The factors affecting the measuring accuracy of natural gamma while drilling.;

Analysis and Improvement of Command Factor Measuring Accuracy for a Missile;

The temperature effect on the measuring accuracy of a magnetostrictive liquid lever sensor;

Improvement of measurement accuracy in testing the residual stresses in auto-frettagea tube;

Influence of background scattering on measurement accuracy of laser radar cross section;

The factors of impacting the X-ray thickness measurement accuracy and methods to maintain