At the same time,data service realizing technique and application model regarding exploration and development main data base as basic one and focusing on exploration and development comprehensive study have been described.

Integrated Web with EIS′subject database;

In order to resolve the problem resulted from the "course-oriented method " in data processing in the information construction of colleges, we bring forward using subject databases to eliminate data redundance and decentralization,and illuminate functions and significances of the information construction.

Generalized code design is realized based on the mixed technique consisting of flexible input interface, modular algorithm, outside importing of calculation formula, subject database, flexible report and browser.

Application of active database technology using Petri net detection in power network supervisory and control;

Modeling with Petri-net on active database rules set;

Query processing in mobile P2P system based on active database;

We proposed establishing subject databases with aggregation matrixes, analyzing subject databases on the aggregation level of entities and studying subject database technology in aggregation analysis method, so that the relativity and tendency of entities could be clearly reflected.

In the course,it is necessary to build a great level data environment with subject databases.