On the basis of the repeated observational data of seismic gravity network since 1990s in Qilianshan-Hexi area,the changes of local geoid in different time scale are calculated with Bruns formula and approximately solution of Stokes\' integral those are usually used for getting the difference of geoid from gravity field model.

This paper introduced the process of the construction of fiducial system for modern surveying of Wuhan city on the whole,then explained and analysed the data process and test of WHCORS、high accurate GPS reference network、accurate level net and areal geoid refine in Wuhan.