Aimed at overcoming the disadvantages of the separation between geological information database and 3-D modeling system in hydraulic and hydro-power 3-D geological modeling software,the interactive design method,which combines 3-D geological database and 3-D modeling software,was proposed.And 3-D geological modeling platform,which is appropriate to hydraulic and hydro-power engineering,was developed on CATIA.By using the Microsoft SQL 8.0,3-D geological modeling database,which achieves the functions like data entry,data query,date delete,excel import and export etc,was established.3-D geological modeling platform was built through Visual Basic.net.This platform includes the basic modules like covering layer,geological layer,hydrological layer,and model analysis etc.When 3-D database is embedded into 3-D geological modeling platform, some functions including drill data importing,virtual drilling,and 3-D geological modeling section graphing can be realized.The design idea on the integration of 3-D geological modeling database and 3-D modeling platform comes true.