The NNW Seismic Belt of Yunnan begins from Zhongdian-Baoshan west of Yunnan, crosses the Eryuan-Heqing fault, Chenghai fault, Honghe fault, Qujiang fault, Lancangjiang fault and Xiaojiang fault, and ends at Xundian and Mile east of Yunnan, on which there are 17 GPS observation stations.

On the basis of GPS observation results of northeastern Tibetan plateau network, we carried out some quantitative experiments on GPS observation optimization of CMONOC project.

In this paper,we introduced the main content and advance of GPS observation network as well as the summary of 1995-1997 two terms observations.

In order to study the feasibility of monitoring the change of urban land subsidence by GPS surveying instead of leveling, two periods of GPS observation and leveling were completed respectively in Ningbo city.

It is proved by GPS surveying practice that GPS network structure have remarkable influence on GPS positioning precision.

The feasibility of monitoring the change of city settlement using GPS surveying instead of leveling is studied.

Error analysis of strain rates from GPS measurements based on Monte Carlo method;

GPS observations for crustal movements in China continent and related geodynamic studies;

This paper is major in the research of the characteristic of vertical crust movement in large scale areas by high precision GPS observations.