Abstract: With the technique of pick up database management, the database of basic factors in the “planting trees and killing oncomelania” system is constructed, by which, all data can be searched, filtered and sorted conveniently. Based on the constructed mathematical models, the dynamic data linking is realized by some Visual Basic functions. Moreover, the connection of data, information and graphics is realized by dynamic data exchange. By the expression of object oriented knowledge, the systemic knowledge class hierarchy is set up, and the corresponding reasoning mechanism is improved. According to the result of mathematical processing of factors relative to intended beach development, site classification and site quality evaluation are completed, and the optimized ecological patterns and technological measures are recommended. The economic, ecological and social effects can be analyzed and evaluated. Some commutative user machine interfaces satisfied GUIstandards are also designed.

Key words: Beaches management, Expert system, Object-oriented knowledge class, Dynamic data linking, latitude, soil factor, leaf trait, climatic factor, Metasequoia glyptostroboides