This paper presents a method for zero position error dynamic calibration of radar based on double station GPS timing and CCD camera & laser theodolite.

New technology for lightweight large primary mirror of theodolite;

3D data registration method based on single theodolite in vision measurement;

Stabilization of LOS for carrier-based theodolite;

Research of Cushioning System for Vehicular Photoelectric Transit;

The Technical Reform for the GDJ Transit;

In the course of the water conservancy project construction measure,leveling instrument and transit survey are commonly used,they both have their advantages and disadvantages,the experience of how to reduce the transit survey error is introduced in the paper.

On the basis of practice,the article puts a new method to monitor the landslide using two transits in short distance range.

The methods to determine horizontal position of bridge component using direction intersection principles and the method to determine elevation position of bridge component using two transits are put forward.