Abstract: On the basis of survey data of old and famous trees in the urban built-up area of Dongguan City,and with development MapObjects basing on microsoft,NET framework and C# and access database,the geographic information system for old and famous trees had been built.This system realizes the function of attribute data management of old and famous trees,the spatial information management,inquiry and data exportation as well as inquiry of inenvironment around old and famous trees,etc.This system provides a digital management platform for old and famous trees' management and protection,information reporting,information sharing,and management decision-making etc.