This paper analyzes subjective and objective reason for producing multi-geospatial data from five aspects: uncertainty of geographic entity and phenomenon,limitations of people\'s cognition and expression,observation error of geographic entity,limitations for computer expressing geographic entity,data manipulate error.

Based on OGSA-DAI,a common method of geospatial data interoperability is proposed for SIG.

Spatial Data Interoperability Based on GML and Web Service;

It also put forward the spatial data interoperability mode based on Oracle Spatial,and implemented some experiments.

WFS(web feature services) is an important part of spatial data interoperability, providing feature-level operations for different GIS data formats.

We analyze the process of data interoperability from the aspects of data model and programmer,and propose a geo-spatial data interoperability method in mechanism of acquisition.

This paper presents the principle and operating define of table trigger technique,and on the basis of an example data operation tracking application,discusses the ways to establish the user s operating logs to provide the safety of data operation with table trigger technique in developing VFP application program.

According to the features of the object oriented database and its query,the mark based data operation parallel executing algorithm is proposed,the theoretical analysis and simulation results show that it is an efficient practical algorithm.